Those are acoustic panels. They're filled with dense insulation and help absorb sound reflections!
Have you posted this before? The whole setup looks familiar to me, somehow...
I've posted a different setup in the same room! This is the latest incarnation. I'm constantly buying and selling equipment, so I like to post an updated picture every few months.
It may be the chair that tipped me off. Or I may be stalking you. At this point, I'm not entirely sure.
He absolutely posted the table when it was finished being built. It was probably a month ago or so. Might not have been in this coolcomputersetups, I can't remember.
LOVE that keyboard. I have 3; one for work, home, and one just for solar backup; lol. (since my home is used in a basement; sometimes it will die after 5 months)
It is a phenomenal keyboard. Mines been running about 7 months straight with no problems!