A weird chart comparing lewd graffiti in ancient Pompeii and 1960s Los AngelesS

The 1973 study "Graffiti: Some Observations and Speculations" by Dr. Harvey Lomas included this colorful chart matching bawdy vandalism from First Century Pompeii with its thematic descendants in Sixties Los Angeles. As you can see here, we've had our mind in the gutter for approximately two millennia.

[Psychoanalytic Electronic Publishing via Mind Hacks]