Claustrophobic in a good way?
I dig this...definitely my favorite of your 4.
It gives a very boxed-in feeling.
It would look amazing painted as a wall-sized mural.
My one tiny gripe about it would be where the red/black checkerboard meet the "back wall" of the piece. I feel like this back wall should've been a deep charcoal or midnight blue, instead of the lighter greenish hue. It makes my eyes jet to that level almost instantly, having to consciously come back to examine the awesome checkered world...whereas if it were darker, I would get more of the "tunnel vision" effect.
But hey...that's just me. I see colors funny sometimes.