I feel a "Which Hand" would work well.

WulfieSmith

I'll always remember when Wife and I were doing an Illusion Show for a Large Deaf Group - in the Middle of the Show someone shouted "STOP TALKING - WE CAN'T HEAR YOU", someone else shouted "His assistant isn't deaf and needs the cues" - the Audience all applauded and almost threw the 1st guy out (there was a signing interpreter on the side of the stage). Don't we all have fun ?

I am trying to come up with a good 3D marking system for a Rubik's Cube...since it would be tactile and still color coded, it could be used for any vision impaired participant. I am thinking about using raised crosses, Xs, circles, depressed circles, etcetera. This could open up the myriad Rubik's routines.