Why, oh why, does our brain enjoy playing tricks on us? Watch this nifty little video if you enjoy playing games...with your mind!

YouTuber greenpro2009 says, "We can't help but "connect the dots", which lead inward toward the center, and that skews our perception of the reality of the parallel pattern."

Which, in plain English, I take to mean this IS really a parallel checkerboard - our minds just don't think so.