I was wondering if anyone would see beyond the simplicity.
I like the fact that the small sphere looks as though it belongs there, but when you look at the reflection in the big sphere, it becomes clear where it is.
The hardest thing to get right was the position of the cube and the main sphere, to line them up so the reflections were *exactly* on the viewline. It made the cube look transparent so you are left to wonder if the small sphere is behind the cube or elsewhere.
Ah well, at least someone got it