diff --git a/app/api/util.go b/app/api/util.go
index 2387488..5cdece7 100644
--- a/app/api/util.go
+++ b/app/api/util.go
@@ -15,6 +15,13 @@ var errorMap = map[error]int{
 	models.ErrBadColor:           400,
 	models.ErrInternal:           500,
 	models.ErrUnknownColorFormat: 400,
+
+	models.ErrSceneInvalidInterval:         400,
+	models.ErrSceneNoRoles:                 400,
+	models.ErrSceneRoleNoStates:            400,
+	models.ErrSceneRoleUnsupportedOrdering: 422,
+	models.ErrSceneRoleUnknownEffect:       422,
+	models.ErrSceneRoleUnknownPowerMode:    422,
 }
 
 type response struct {
diff --git a/app/services/scene/manager.go b/app/services/scene/manager.go
new file mode 100644
index 0000000..3b2ac4c
--- /dev/null
+++ b/app/services/scene/manager.go
@@ -0,0 +1,36 @@
+package scene
+
+import (
+	"git.aiterp.net/lucifer/new-server/models"
+	"sync"
+)
+
+type Manager struct {
+	mu          sync.Mutex
+	assignments map[int]*Scene
+	scenes      []*Scene
+}
+
+func (mgr *Manager) UpdateDevice(device *models.Device) {
+
+}
+
+func (mgr *Manager) GetUnassigned(devices []models.Device) []models.Device {
+	mgr.mu.Lock()
+	defer mgr.mu.Unlock()
+
+	res := make([]models.Device, 0, len(devices))
+	for _, device := range devices {
+		if _, ok := mgr.assignments[device.ID]; !ok {
+			res = append(res, device)
+		}
+	}
+
+	return res
+}
+
+var globalManager = &Manager{}
+
+func Get() *Manager {
+	return globalManager
+}
diff --git a/app/services/scene/scene.go b/app/services/scene/scene.go
new file mode 100644
index 0000000..17bb28c
--- /dev/null
+++ b/app/services/scene/scene.go
@@ -0,0 +1,87 @@
+package scene
+
+import (
+	"git.aiterp.net/lucifer/new-server/models"
+	"time"
+)
+
+type Scene struct {
+	startTime time.Time
+	duration  time.Duration
+	tag       string
+	data      models.Scene
+	roleList  [][]models.Device
+	deviceMap map[int]*models.Device
+	roleMap   map[int]int
+	changes   map[int]models.NewDeviceState
+}
+
+func (s *Scene) UpdateScene(scene models.Scene) {
+	s.data = scene
+	s.roleMap = make(map[int]int)
+
+	for _, device := range s.deviceMap {
+		s.moveDevice(*device)
+	}
+}
+
+func (s *Scene) UpsertDevice(device models.Device) {
+	s.deviceMap[device.ID] = &device
+	s.moveDevice(device)
+}
+
+func (s *Scene) RemoveDevice(device models.Device) {
+	delete(s.deviceMap, device.ID)
+	delete(s.roleMap, device.ID)
+}
+
+func (s *Scene) runRole(index int) {
+
+}
+
+func (s *Scene) moveDevice(device models.Device, run bool) {
+	oldRole, hasOldRole := s.roleMap[device.ID]
+	newRole := s.data.RoleIndex(&device)
+
+	if hasOldRole && oldRole == newRole {
+		return
+	}
+
+	if hasOldRole {
+		for i, device2 := range s.roleList[oldRole] {
+			if device2.ID == device.ID {
+				s.roleList[oldRole] = append(s.roleList[oldRole][:i], s.roleList[oldRole][i+1:]...)
+				break
+			}
+		}
+
+		s.runRole(oldRole)
+	}
+
+	s.roleMap[device.ID] = newRole
+	s.runRole(newRole)
+}
+
+func (s *Scene) intervalNumber() int64 {
+	intervalDuration := time.Duration(s.data.IntervalMS) * time.Millisecond
+
+	return int64(time.Since(s.startTime) / intervalDuration)
+}
+
+func (s *Scene) intervalFac() float64 {
+	return clamp(float64(time.Since(s.startTime)) / float64(s.duration))
+}
+
+func (s *Scene) positionFac(i, len int) float64 {
+	return clamp(float64(i) / float64(len))
+}
+
+func clamp(fac float64) float64 {
+	if fac > 1.00 {
+		return 1.00
+	} else if fac < 0.00 {
+		return 0.00
+	} else {
+		return fac
+	}
+}
\ No newline at end of file
diff --git a/models/device.go b/models/device.go
index de51e88..e363034 100644
--- a/models/device.go
+++ b/models/device.go
@@ -3,6 +3,7 @@ package models
 import (
 	"context"
 	"strings"
+	"time"
 )
 
 type Device struct {
@@ -20,8 +21,8 @@ type Device struct {
 }
 
 type DeviceUpdate struct {
-	Icon           *string             `json:"icon"`
-	Name           *string             `json:"name"`
+	Icon           *string            `json:"icon"`
+	Name           *string            `json:"name"`
 	UserProperties map[string]*string `json:"userProperties"`
 }
 
@@ -37,6 +38,13 @@ type DeviceState struct {
 	Temperature float64    `json:"temperature"`
 }
 
+type DeviceScene struct {
+	SceneID    int       `json:"sceneId"`
+	Time       time.Time `json:"time"`
+	DurationMS int64     `json:"duration"`
+	Tag        string    `json:"tag"`
+}
+
 type NewDeviceState struct {
 	Power       *bool    `json:"power"`
 	Color       *string  `json:"color"`
@@ -170,3 +178,44 @@ func (d *Device) SetState(newState NewDeviceState) error {
 
 	return nil
 }
+
+func (s *NewDeviceState) Interpolate(other NewDeviceState, fac float64) NewDeviceState {
+	n := NewDeviceState{}
+
+	if s.Power != nil && other.Power != nil {
+		if fac >= 0.5 {
+			n.Power = other.Power
+		} else {
+			n.Power = s.Power
+		}
+	}
+
+	if s.Color != nil && other.Color != nil {
+		sc, err := ParseColorValue(*s.Color)
+		oc, err2 := ParseColorValue(*other.Color)
+		if err == nil && err2 == nil {
+			rc := ColorValue{}
+			rc.Hue = interpolateFloat(sc.Hue, oc.Hue, fac)
+			rc.Saturation = interpolateFloat(sc.Saturation, oc.Saturation, fac)
+			rc.Kelvin = interpolateInt(sc.Kelvin, oc.Kelvin, fac)
+
+			rcStr := rc.String()
+			n.Color = &rcStr
+		}
+	}
+
+	if s.Intensity != nil && other.Intensity != nil {
+		n.Intensity = new(float64)
+		*n.Intensity = interpolateFloat(*s.Intensity, *other.Intensity, fac)
+	}
+
+	return n
+}
+
+func interpolateFloat(a, b, fac float64) float64 {
+	return (a * (1 - fac)) + (b * fac)
+}
+
+func interpolateInt(a, b int, fac float64) int {
+	return int((float64(a) * (1 - fac)) + (float64(b) * fac))
+}
diff --git a/models/errors.go b/models/errors.go
index 8566d9a..ee40e6b 100644
--- a/models/errors.go
+++ b/models/errors.go
@@ -22,3 +22,10 @@ var ErrInvalidPacketSize = errors.New("invalid packet size")
 var ErrReadTimeout = errors.New("read timeout")
 var ErrUnrecognizedPacketType = errors.New("packet type not recognized")
 var ErrBridgeRunningRequired = errors.New("this operation cannot be performed when bridge is not running")
+
+var ErrSceneInvalidInterval = errors.New("scene interval must be 0 (=disabled) or greater")
+var ErrSceneNoRoles = errors.New("scene cannot have zero rules")
+var ErrSceneRoleNoStates = errors.New("scene rule has no states")
+var ErrSceneRoleUnsupportedOrdering = errors.New("scene rule has an unsupported ordering")
+var ErrSceneRoleUnknownEffect = errors.New("scene rule has an unknown effect")
+var ErrSceneRoleUnknownPowerMode = errors.New("scene rule has an unknown power mode")
diff --git a/models/scene.go b/models/scene.go
new file mode 100644
index 0000000..c2d5a29
--- /dev/null
+++ b/models/scene.go
@@ -0,0 +1,204 @@
+package models
+
+import (
+	"math"
+	"math/rand"
+	"sort"
+	"strings"
+)
+
+type Scene struct {
+	ID         int         `json:"id"`
+	Name       string      `json:"name"`
+	IntervalMS int64       `json:"interval"`
+	Roles      []SceneRole `json:"roles"`
+}
+
+func (s *Scene) Validate() error {
+	if s.IntervalMS < 0 {
+		return ErrSceneInvalidInterval
+	}
+	if len(s.Roles) == 0 {
+		return ErrSceneNoRoles
+	}
+
+	for _, role := range s.Roles {
+		err := role.Validate()
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (s *Scene) Role(device *Device) *SceneRole {
+	index := s.RoleIndex(device)
+	if index == -1 {
+		return nil
+	}
+
+	return &s.Roles[index]
+}
+
+func (s *Scene) RoleIndex(device *Device) int {
+	for i, role := range s.Roles {
+		if role.TargetKind.Matches(device, role.TargetValue) {
+			return i
+		}
+	}
+
+	return -1
+}
+
+type SceneEffect string
+
+const (
+	SEStatic     SceneEffect = "Plain"
+	SERandom     SceneEffect = "Random"
+	SEGradient   SceneEffect = "Gradient"
+	SETransition SceneEffect = "Transition"
+)
+
+type SceneRole struct {
+	Effect      SceneEffect      `json:"effect"`
+	PowerMode   ScenePowerMode   `json:"overridePower"`
+	TargetKind  ReferenceKind    `json:"targetKind"`
+	TargetValue string           `json:"targetValue"`
+	Interpolate bool             `json:"interpolate"`
+	Order       string           `json:"order"`
+	States      []NewDeviceState `json:"states"`
+}
+
+func (r *SceneRole) Validate() error {
+	if len(r.States) == 0 {
+		return ErrSceneRoleNoStates
+	}
+
+	switch r.TargetKind {
+	case RKTag, RKBridgeID, RKDeviceID, RKName, RKAll:
+	default:
+		return ErrBadInput
+	}
+
+	switch r.PowerMode {
+	case SPScene, SPDevice, SPOverride:
+	default:
+		return ErrSceneRoleUnknownPowerMode
+	}
+
+	switch r.Effect {
+	case SEStatic, SERandom, SEGradient, SETransition:
+	default:
+		return ErrSceneRoleUnknownEffect
+	}
+
+	switch r.Order {
+	case "", "-name", "name", "+name", "-id", "id", "+id":
+	default:
+		return ErrSceneRoleUnsupportedOrdering
+	}
+
+	return nil
+}
+
+func (r *SceneRole) ApplyOrder(devices []Device) {
+	if r.Order == "" {
+		return
+	}
+
+	desc := strings.HasPrefix(r.Order, "-")
+
+	orderKey := r.Order
+	if desc || strings.HasPrefix(r.Order, "+") {
+		orderKey = orderKey[1:]
+	}
+
+	switch orderKey {
+	case "id":
+		sort.Slice(devices, func(i, j int) bool {
+			if desc {
+				return devices[i].ID > devices[j].ID
+			}
+
+			return devices[i].ID < devices[j].ID
+		})
+	case "name":
+		sort.Slice(devices, func(i, j int) bool {
+			if desc {
+				return strings.Compare(devices[i].Name, devices[j].Name) < 0
+			}
+
+			return strings.Compare(devices[i].Name, devices[j].Name) > 0
+		})
+	}
+}
+
+func (r *SceneRole) ApplyEffect(device *Device, intervalFac float64, positionFac float64) (newState NewDeviceState, deviceChanged bool) {
+	switch r.Effect {
+	case SEStatic:
+		newState = r.States[0]
+	case SERandom:
+		newState = r.State(rand.Float64())
+	case SEGradient:
+		newState = r.State(positionFac)
+	case SETransition:
+		newState = r.State(intervalFac)
+	}
+
+	switch r.PowerMode {
+	case SPDevice:
+		newState.Power = nil
+	case SPScene:
+		// Do nothing
+	case SPOverride:
+		if newState.Power != nil && device.State.Power != *newState.Power {
+			device.State.Power = *newState.Power
+			deviceChanged = true
+		}
+	}
+
+	return
+}
+
+func (r *SceneRole) State(fac float64) NewDeviceState {
+	if len(r.States) == 0 {
+		return NewDeviceState{}
+	} else if len(r.States) == 1 {
+		return r.States[0]
+	}
+
+	if r.Interpolate {
+		if len(r.States) == 2 {
+			return r.States[0].Interpolate(r.States[1], fac)
+		} else {
+			pos := fac * float64(len(r.States)-1)
+			start := math.Floor(pos)
+			localFac := pos - start
+
+			return r.States[int(start)].Interpolate(r.States[int(start)+1], localFac)
+		}
+	} else {
+		index := int(fac * float64(len(r.States)))
+		if index == len(r.States) {
+			index = len(r.States) - 1
+		}
+
+		return r.States[index]
+	}
+}
+
+type ScenePowerMode string
+
+const (
+	SPDevice   ScenePowerMode = "Device"   // Device state decides power. Scene state may only power off.
+	SPScene    ScenePowerMode = "Scene"    // Scene state decide power.
+	SPOverride ScenePowerMode = "Override" // Same as above, but Scene state set Device state' power. This is good for "wake up" scenes.
+)
+
+type SceneAssignment struct {
+	Scene  *Scene
+	Device *Device
+	Tag    string
+}
+
diff --git a/models/shared.go b/models/shared.go
index f92a20f..39aced2 100644
--- a/models/shared.go
+++ b/models/shared.go
@@ -1,5 +1,10 @@
 package models
 
+import (
+	"strconv"
+	"strings"
+)
+
 type ReferenceKind string
 
 var (
@@ -9,3 +14,53 @@ var (
 	RKAll      ReferenceKind = "All"
 	RKName     ReferenceKind = "Name"
 )
+
+func (rk ReferenceKind) Matches(device *Device, value string) bool {
+	switch rk {
+	case RKName:
+		if strings.HasPrefix(value, "*") {
+			return strings.HasSuffix(device.Name, value[1:])
+		} else if strings.HasSuffix(value, "*") {
+			return strings.HasPrefix(device.Name, value[:len(value)-1])
+		} else {
+			return device.Name == value
+		}
+	case RKDeviceID:
+		idStr := strconv.Itoa(device.ID)
+		for _, idStr2 := range strings.Split(value, ",") {
+			if idStr == idStr2 {
+				return true
+			}
+		}
+	case RKBridgeID:
+		idStr := strconv.Itoa(device.BridgeID)
+		for _, idStr2 := range strings.Split(value, ",") {
+			if idStr == idStr2 {
+				return true
+			}
+		}
+	case RKTag:
+		hadAny := false
+		for _, tag := range strings.Split(value, ",") {
+			if strings.HasPrefix(tag, "-") {
+				if device.HasTag(tag[1:]) {
+					return false
+				}
+			} else if strings.HasPrefix(tag, "+") {
+				if !device.HasTag(tag[1:]) {
+					return false
+				}
+			} else {
+				if device.HasTag(tag) {
+					hadAny = true
+				}
+			}
+		}
+
+		return hadAny
+	case RKAll:
+		return true
+	}
+
+	return false
+}