This is the first of the 2 laser shows I made for Touhou-sai 2011. This song is by ARM of IOSYS, titled 「闇光」 (I hope my “Dark/Light” translation is okay).
Although this was meant to be a beam show, I made some danmaku-like patterns that can’t be seen properly in the air, so I included a view of it projecting directly onto a flat surface so these can be seen easily.