Visual Memory Distortion

Two people look at the same image and both see something totally different! The first volunteer is given a picture to look at; the magician starts to talk about perception. The first volunteer then hands the picture they are looking at to a second person, and the second person looks at the image while the magician talks. Yet when asked they both describe completely opposite images! All this is attributed to your abilities to perform Word Magic. Then everyone discovers that the image both participants were looking at was completely different from either description, this again will be attributed to your weaving a spell over the two helpers.