Are these shapes supposed to be orthographic projections of 3 dimensional objects? And we are supposed to figure out which 3D shape would have the smallest number of sides? Is that the puzzle?

Originally posted by sonhouse Are these shapes supposed to be orthographic projections of 3 dimensional objects? And we are supposed to figure out which 3D shape would have the smallest number of sides? Is that the puzzle?

Objects have faces, vertices and corners not sides.
Gatel solved it.

Actually the curve for D isn't a curve, if you look closely, you can see the pixels, which shouldn't be possible for a curve. Therefore, the frame is the least sided figure in the picture.