A Tre

Height,width,"depth"
A painting,
A space ...

A cube has six fields,
regular squares.

To make it more clear that the one in the distance
comes very near in being the one at the front,
I gave them the same size.

The canvas is a regular square,
I suppose that leaves five fields.
One on the left, one on the right,
One above, one under,
One in the distance.

Four edges.

Height, width, "depth",
A painting,
A space ...