The Swedish obstetrician and gynaecologist, Thure Brandt (1819-1895), developed methods and exercises that became recognized in Europe in the late 19th century. So in this German commission the visual guide for the exercises were de-sexualized and thus look like grey alines. Funny, since when we think of grey aliens, no matter if we think of them being from outer space or as time travelers, they are androgyn to the maximum. As we might expect from some far and distant, but highly technological society would make us. No sex due to in in vitro fertilization, no mouth for communication due to wireless technology or telephony and so on.
Full book for download at Archive.org – Heilgymnastik in der Gynaekologie