The Ghost of a Flea, William Blake (c. 1819-20)

"The ghost's spine is a throbbing, gristly column shooting into his scaly head with its bulging eyes and voracious tongue; his massive muscles are red-toned, as if infused with dried blood, and his loping, crushing walk is that of a colossus come to life. This vastness and mad-eyed bestiality contrasts with the visible form of the spirit's physical embodiment, which can be seen on the floor between his veined legs: a little flea."