On NPR an awesome article (with sound) about the Oramics machine by Daphne Oram. Daphne Oram was a composer and innovative electronic musician who worked at BBC Radiophonic Workshop (which among others worked on the sounds for Doctor Who) and later started her own workshop. One of the devices she created was the Oramics machine, an early synth which didn’t have a keyboard or anything, nope you had to draw on it. It had been lost and Daphne Oram passed away a few years ago, until recently, the machine popped up again:
I do recommend reading the article and listening to the interview at NPR too.