A "grandpa with glasses" is using paper-crafting skills to trick the eye. The artist uses paper-cutting techniques on leaves as a way of coping with ADHD. Each piece is hand drawn and then carefully ...

Jean-Baptiste Oudry, "Belphagore" (1734), brush and black ink, gray wash, heightened with white gouache, on blue paper; 12 1/4 x 10 1/4 inches (image via public domain, all images courtesy Getty ...