D'you know, what a residue feeling is?

D'you know, what a residue feeling is? If you hear a sound for quite a time and it suddenly mutes, it still feels like it continues for some time. If you watch a bright window, then close your eyes, it seems there's some negative colored window, which slowly fades into darkness.

I wore #catears from @c3cat@chaos.social during the whole #39c3, now it still feels I have some on my head.