Kusanagi - Yugen - Celestial [post/math rock]
I think the album counts more as post rock than math rock, but this track in particular has some very math rock vibes to it, and I thought that the community would appreciate it. I was unfamiliar with them until recently, and they just released this album this week.
https://kusanagi.bandcamp.com/track/celestialOpen linkView original on sopuli.xyz
Also check out lightning flowers.