Argue it if you like, but students do need to be told NO! It will not stiffle their creativity!! We as teachers are there to instruct our students, and I've personally found a "No-No" board extremely helpful. Some students don't realize that blue clouds are just lazy clouds....that the sun is not a person & does not have a face....or that their mother did not pick up a stick and call it her child! So, this is my board...and I go over each point with my students EVERY YEAR!! My forth graders love my theatrical presentation!! ha ha