The art of illustration is a funny thing, because it relies on using lines and coloring to trick the mind into thinking it’s looking at a three-dimensional object. But if the whole effect is a matter of perspective, changing how you look at a picture will make you think you’re seeing something else.
Sometimes the result is cute, like when cherry blossom petals turn into a litter of puppies. At other times, the result is quite a bit pervier, like what one traveler can no longer unsee in the symbol for Japan’s bullet train.