When it was discovered that the curtain itself was Parrhasius' painting, Zeuxis was forced to concede defeat, for while his work had managed to fool the eyes of birds, Parrhasius had deceived the eyes of an artist.
Zeuxis was forced to concede defeat. His work had managed to fool the eyes of birds. Parrhasius had deceived the eyes of an artist. The curtain itself was Parrhasius' painting. This was discovered.