Stroboscopic Effect

https://en.wikipedia.org/wiki/Strobos...
Pictures for printing:
https://ibb.co/4P1CsZ5
https://ibb.co/9pRGshs
https://ibb.co/ts1LDB3
https://ibb.co/FH8GhRs
https://ibb.co/dbTyZ99
Generator with changing duty cycle (without housing) - https://ali.ski/NEBCrW
Generator with a change in duty cycle (in the case) - https://ali.ski/VkzkS5