I always thought this was cool
https://forums.yoyoexpert.com/t/3yo3-hourglasses/62277/4
I just got an Acyrllion
https://forums.yoyoexpert.com/t/3yo3-acryllion-review-lots-of-pictures-by-raymond-pruitt/9919
Looks like @Glenacius_K used to own one of these as well!