I've done this; the security lady aggressively shouted at me and frantically pointed at a small sign on the other side of the exhibit. Since some exhibits were "please DO touch" interactive I thought it wasn't that bad of a mistake but she disagreed. I'm guessing she responded to strongly because I was far from the first person to make this mistake, which is a good indication that your design sucks...
"You must be this tall and clairvoyant to enter".
Still not as bad as the traffic controller who physically assaulted me because I failed to see the "stop sign" given in the car lane on the other end of the road from my bicycle in the bicycle lane... Ran up to me and pushed me off my bike shouting "PEOPLE HAVE BEEN IGNORING THIS ALL NIGHT AND I'M SICK OF IT!" ... yeah, because what you're doing makes no sense mate...
"You must be this tall and clairvoyant to enter".
Still not as bad as the traffic controller who physically assaulted me because I failed to see the "stop sign" given in the car lane on the other end of the road from my bicycle in the bicycle lane... Ran up to me and pushed me off my bike shouting "PEOPLE HAVE BEEN IGNORING THIS ALL NIGHT AND I'M SICK OF IT!" ... yeah, because what you're doing makes no sense mate...