The sign should obviously have read "Please do not touch. Even clean hands damage surfaces".
And all the others in the gallery did just that - or so I saw afterwards. But this was the first one I actually noticed. What I assume to be somebody's deliberate removal (damage) of one letter made it all the more noticeable.
The original notice delivers a message that goes unnoticed. The altered one is much more noticeable because it is visually haptic - you subconsciously feel it as well as read it.
If you just make claims, they'll be ignored. If you show them to be true, they won't be.
