Sence Defying Cage

last night twice I dreamed this dream, I woke up from the dream and couldnt remember it or make any sense out of it, I went back to sleep again and same thing happened, I was being showed a futuristic maybe even alien cage, that had several shape shifting properties, it levitate, it could morph and it could tranform what was inside... Both times during the dream everything made sense and had a purpose, but after I woke it was all very vague and very hard to understand...