Typo 12:51 Jul 4, 2018
I'm with Phil on this one. There is precisely one Google result for "juego de espectros" in relation to Edinburgh's Camera Obscura, and that one is presumably related to your source text. I honestly don't think it makes any sense, though I admire Neil's attempt to square this circle, and it's true that there are "spectral illusions" on the lower floors (nothing to do with the actual Camera Obscura). It does in fact use mirrors, and a number of Spanish-language sites refer to the "juego de espejos" of the Camera Obscura. So I think it's just a mistake. | 
peer agreement (net): +1
