I was recently investigating a CSS shadow issue that looked like an uneven shadow across the bottom of an element that had a lighter section and a darker sectio

I was recently investigating a CSS shadow issue that looked like an uneven shadow across the bottom of an element that had a lighter section and a darker section, but it turned out to be illusion #6! I had to do the color picker method on the shadow to convince myself, and even after I had convinced myself by drawing a single color line in between, my eyes were still fooled. Very tricky!