Can you spot the error?

Have a look at this photo and read what the notice says with attention . Can you spot the error?

Well, have you? According to the information the kindergarten is really exclusive.

Remember the difference between : the kids’ studio and the kid’s studio . In the first case, the studio is for kids in the plural  whereas in the second case it’s just for one kid. I can’t see why anybody would want to send their children to a kindergaten where the kid will have to play with the teacher .