Yup, this is just a random shot that I accidentally taken. Not much more than I can say than that.
This is the “Brain Training” or “Brain Age” Assist Trophy. Given the angle, you can see the numbers are actually on the fighter plain, assuming you where able to see them. As I said this was a misfire on the shutter, I just never deleted it.
Ok, There is a bug in Destiny 1 and 2, which results in you arriving in a empty Tower. Usually The Tower will fill up within a few seconds of landing when that happens, but this time it took long enough to reach the Vanguard table, which I posted before.
So in the early Destiny 2 lore, Eris left the tower a some time before the Red War, and just before she left, she had a chat with Asher Mir. I could imagine her section of The Tower looking like this during the time she was away.