Looking on the internets for an image that would represent an environment that would be both playful and secure for kids, I stumbled across this maze by Peter Randall (photo credit: Martyn Barratt):

Why do I blog this? this is tight to my interest in spatial environment and their legibility. This one is outdoor but you have museums that have indoor maze for kids; those need to be safe and allow people to escape quickly (and the walls are sometimes 30cm high).