I have to do a lot of research for my job, and in the course of my Googling, I find all manner of bizarre things. Yesterday, I was looking for examples I could use to teach kids how to make shadow puppets. I assumed I'd see lots of dogs, some ducks, maybe a bird or two. Instead, I found a ridiculously awesome shadow puppetry guide, originally published in 1859. These aren't shadow puppets so much as Victorian gang signs.
Reading Rocket Man by William Elliott Hazelgrove
Playing Pearl Jam radio on Pandora
Graphics from Hand Shadows by Henry Bursill, published in 1859 by Griffith & Farran, corner of St. Paul's churchyard