in fact we always been cheated by our own eyes when aim at a target. even with a scope too.
here is proove:
Feeling ill just looking at these. If I look long enough at the parallel lines, I can two rows to appear correct but it seems to make the rest look even worse.
Just Photoshopped it and if you change the black to a lighter color the distortion diminishes.
the closer you look the more parallel they start to appear..move away and they really bend!!!