diff --git a/configure.py b/configure.py
index 03ad0f4a..e00d9ba8 100644
--- a/configure.py
+++ b/configure.py
@@ -1024,7 +1024,7 @@ config.libs = [
             Object(Matching, "actor/ac_museum.c"),
             Object(Matching, "actor/ac_museum_fish.c"),
             Object(Matching, "actor/ac_museum_fossil.c"),
-            Object(NonMatching, "actor/ac_museum_indoor.c"),
+            Object(Matching, "actor/ac_museum_indoor.c"),
             Object(Matching, "actor/ac_museum_insect.c"),
             Object(Matching, "actor/ac_museum_picture.c"),
             Object(Matching, "actor/ac_my_house.c"),
diff --git a/include/ac_museum_indoor.h b/include/ac_museum_indoor.h
index 94cc600b..16c653ba 100644
--- a/include/ac_museum_indoor.h
+++ b/include/ac_museum_indoor.h
@@ -8,6 +8,14 @@
 extern "C" {
 #endif
 
+typedef struct museum_indoor_actor_s MUSEUM_INDOOR_ACTOR;
+
+struct museum_indoor_actor_s {
+    ACTOR actor_class;
+    f32 alpha;
+    int cull_index;
+};
+
 extern ACTOR_PROFILE Museum_Indoor_Profile;
 
 #ifdef __cplusplus
@@ -15,4 +23,3 @@ extern ACTOR_PROFILE Museum_Indoor_Profile;
 #endif
 
 #endif
-
diff --git a/src/actor/ac_museum_indoor.c b/src/actor/ac_museum_indoor.c
new file mode 100644
index 00000000..00bdbd1e
--- /dev/null
+++ b/src/actor/ac_museum_indoor.c
@@ -0,0 +1,139 @@
+#include "ac_museum_indoor.h"
+
+#include "m_name_table.h"
+#include "m_scene.h"
+#include "m_kankyo.h"
+#include "sys_matrix.h"
+#include "m_play.h"
+#include "m_common_data.h"
+
+static void Museum_Indoor_Actor_ct(ACTOR* actorx, GAME* game);
+static void Museum_Indoor_Actor_draw(ACTOR* actorx, GAME* game);
+static void Museum_Indoor_Actor_dt(ACTOR* actorx, GAME* game);
+static void Museum_Indoor_Actor_move(ACTOR* actorx, GAME* game);
+
+ACTOR_PROFILE Museum_Indoor_Profile = {
+    mAc_PROFILE_MUSEUM_INDOOR,
+    ACTOR_PART_CONTROL,
+    ACTOR_STATE_CAN_MOVE_IN_DEMO_SCENES | ACTOR_STATE_NO_DRAW_WHILE_CULLED | ACTOR_STATE_NO_MOVE_WHILE_CULLED,
+    EMPTY_NO,
+    ACTOR_OBJ_BANK_KEEP,
+    sizeof(MUSEUM_INDOOR_ACTOR),
+    Museum_Indoor_Actor_ct,
+    Museum_Indoor_Actor_dt,
+    Museum_Indoor_Actor_move,
+    Museum_Indoor_Actor_draw,
+    NULL,
+};
+
+typedef struct museum_indoor_cull_info_s {
+    int scene;
+    int type;
+    Gfx* cull_gfx;
+} aMI_cull_info_c;
+
+extern Gfx rom_museum4_wall_model[];
+extern Gfx rom_museum5_wall_model[];
+
+static aMI_cull_info_c aMI_museum_indoor_cull_info[] = {
+    { SCENE_MUSEUM_ROOM_INSECT, 1, rom_museum4_wall_model },
+    { SCENE_MUSEUM_ROOM_FISH, 0, rom_museum5_wall_model },
+};
+
+static void aMI_AlphaToON(f32* alpha_p) {
+    (*alpha_p) += 24.0f;
+    if (*alpha_p < 0.0f) {
+        *alpha_p = 0.0f;
+    } else if (*alpha_p > 255.0f) {
+        *alpha_p = 255.0f;
+    }
+}
+
+static void aMI_AlphaToOFF(f32* alpha_p) {
+    (*alpha_p) -= 24.0f;
+    if (*alpha_p < 0.0f) {
+        *alpha_p = 0.0f;
+    } else if (*alpha_p > 255.0f) {
+        *alpha_p = 255.0f;
+    }
+}
+
+static int aMI_GetThisSceneCullIndex(void) {
+    int i;
+    
+    for (i = 0; i < ARRAY_COUNT(aMI_museum_indoor_cull_info); i++) {
+        if (Save_Get(scene_no) == aMI_museum_indoor_cull_info[i].scene) {
+            return i;
+        }
+    }
+
+    return -1;
+}
+
+static void Museum_Indoor_Actor_ct(ACTOR* actorx, GAME* game) {
+    MUSEUM_INDOOR_ACTOR* museum_indoor = (MUSEUM_INDOOR_ACTOR*)actorx;
+
+    museum_indoor->alpha = 255.0f;
+    museum_indoor->cull_index = aMI_GetThisSceneCullIndex();
+}
+
+static void Museum_Indoor_Actor_dt(ACTOR* actorx, GAME* game) {
+    // nothing
+}
+
+static void Museum_Indoor_Actor_draw(ACTOR* actorx, GAME* game) {
+    MUSEUM_INDOOR_ACTOR* museum_indoor = (MUSEUM_INDOOR_ACTOR*)actorx;
+
+    if (museum_indoor->cull_index != -1) {
+        Gfx* cull_gfx = aMI_museum_indoor_cull_info[museum_indoor->cull_index].cull_gfx;
+        u8 r;
+        u8 g;
+        u8 b;
+        u8 a = (int)museum_indoor->alpha;
+
+        mEnv_GetRoomPrimColor(&r, &g, &b, (GAME_PLAY*)game);
+        OPEN_DISP(game->graph);
+
+        Matrix_translate(0.0f, 0.0f, 0.0f, 0);
+        Matrix_RotateY(0, 1);
+        Matrix_scale(0.0625f, 0.0625f, 0.0625f, 1);
+
+        gSPMatrix(NEXT_POLY_XLU_DISP, _Matrix_to_Mtx_new(game->graph), G_MTX_NOPUSH | G_MTX_LOAD | G_MTX_MODELVIEW);
+        gDPSetPrimColor(NEXT_POLY_XLU_DISP, 0, 0, r, g, b, a);
+        gSPDisplayList(NEXT_POLY_XLU_DISP, cull_gfx);
+
+        CLOSE_DISP(game->graph);
+    }
+}
+
+static void aMI_SetAlpha(MUSEUM_INDOOR_ACTOR* museum_indoor, GAME* game) {
+    int cull_idx = museum_indoor->cull_index;
+
+    if (cull_idx != -1) {
+        int camera_state = Camera2NormalState_get((GAME_PLAY*)game);
+        f32* alpha_p = &museum_indoor->alpha;
+
+        switch (aMI_museum_indoor_cull_info[cull_idx].type) {
+            case 0:
+                if (camera_state == 3 || camera_state == 7) {
+                    aMI_AlphaToOFF(alpha_p);
+                } else {
+                    aMI_AlphaToON(alpha_p);
+                }
+                break;
+            case 1:
+                if (camera_state == 1 || camera_state == 5) {
+                    aMI_AlphaToOFF(alpha_p);
+                } else {
+                    aMI_AlphaToON(alpha_p);
+                }
+                break;
+        }
+    }
+}
+
+static void Museum_Indoor_Actor_move(ACTOR* actorx, GAME* game) {
+    MUSEUM_INDOOR_ACTOR* museum_indoor = (MUSEUM_INDOOR_ACTOR*)actorx;
+
+    aMI_SetAlpha(museum_indoor, game);
+}