This is the first part of the answer. The second part is that, since we define the left and right on an object relatively to its front and back, flipping the fr

This is the first part of the answer. The second part is that, since we define the left and right on an object relatively to its front and back, flipping the front and back also swaps how left and right are defined. There is no confusion with top and bottom as they are not defined relative to front and back.