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This is amazing! I've been staring at it for a long time, trying to figure out what it is. I'm probably way off, but I think I see the reflection of a building - like a parking garage - within a colored glass disk-shaped thing (like ones used on the bottom of an aquarium) that is nested among stones which may be part of a rock wall. Okay, now you can tell me, have I completely lost my mind?! Lol

you are totally correct. :)

This is an amazing idea and a very high quality work!