It may have been the seductive call of museum-grade air conditioning. It may, as the museum's curator suggests, have been a glimpse through the windows of friendly-looking black cats in a photo exhibition. It may simply have been feline curiosity. Whatever the reason, in the summer of 2016, the security guards of the Onomichi City Museum of Art in Hiroshima, Japan, found themselves fending off an irrepressible visitor: a sleek ...