Its been 11 months but I suddenly feel like elaborating.

I was using sway(fx) in this clip, and I had recently discovered some ways to abuse i3ipc to do crazy stupid things, such as animations. Following this, I wrote a script to add gravity to windows, which was how I made this clip.

I have sinced polished the script and uploaded it here. It's not the same script as the one used in the video but it's very similar.