Did Feyerabend read Perry or Mach? Probably the latter, at least. But here’s a nice little story from his Three Dialogues on Knowledge.
“B: … Some years ago I was walking towards a wall and saw a very disreputable individual coming towards me. ‘Who is that bum?’ I asked myself – and then I discovered that the wall was in fact a mirror and that I had been looking at myself. At once the bum turned into an elegant and intelligent-looking character.”