How to make Beat/Beep Blocks?

Here’s an example: https://gyazo.com/17072a632909fa3766d6ab8f76b2c852

I basically want to make two blocks that are tangible for a few seconds then intangible for a few seconds. Switching in and out. Like block 1 is tangible but block 2 is intangible then they switch to having block 1 be intangible and block 2 being tangible. I hope this makes sense.

[also completely unrelated but idk if they’re called beat blocks or beep blocks lol]

All you’re doing is tweening, for the intangiblity you’re tweening the transparency and for the switching you’re tweening the size.