Great guideline from the Association of Children’s Museums 2010 Interactivity panel “The Changing Face of Technology in Children’s Museums”.

The 3/6/9/12 rule:

No computer screens before age 3, no internet before age 6, no electronic gaming until age 9 and no unsupervised internet before age 12.

Almost all of my favorite projects didn’t have design help.

City Museum
Mutter
Exploratorium

The places grew out of a passion to create. No one can design that, it happens. You can create a culture and an environment that fosters creativity, exploration and discovery, but you can’t design it.