I stretched a canvas over 5 sides of a box frame. The front is a perspective view into 6 rows of columns and arches. The two side views "look" into the same "space", but from different perspectives. The top "looks" down at the columns through rosettes in the ceiling, and the bottom is painted like the bottom of the floor stones.

Looking at any one side you see a perfectly sensible perspective image. Looking at 2 or 3 sides forces the viewer to resolve the differences in perspective. All the edges connect the faces "normally", which helps.