20. A system as recited in claim 14 , wherein the direction the user is facing when uttering the sound undergoes a change to a different direction while the user utters the sound.
14. A system comprising: one or more processors; and computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform acts comprising: causing display of an image on a surface; determining a characteristic of a sound uttered by a user, wherein the characteristic includes at least a direction the user is facing when uttering the sound; ceasing display of the image on the surface; and causing display of the image on a different surface.