On the left is a vibrator dating back to 1909 (accessed at https://www.bbc.com/future/article/20181107-the-history-of-the-vibrator, source unknown). On the right is a manually powered vibration device promoted as relieving pain (accessed at https://www.dameproducts.com/blogs/news/sexual-history-the-origins-of-the-vibrator, source unknown).