Pass Through Building:
In the weird mansion after collecting the kaleidoscope, the girl tells you another 
riddle and you will go through another door into a room with a projector. Summon 
Astral and fly into the corner with the rocking horse. Position yourself above the 
horse, then use Astral's abilities to walk. If done correctly you should drop in to 
the corner and be pushed outside the building. Return to flying mode and fly 
around the outside of the room. You might see things that can help you solve the 
puzzle.