I continue to think about the idea of lowering barriers to experimentation, and an idea that came up is in the category of play: Put things in your environment that invite playful interaction. For example, someone found that putting out musical instruments - even simple ones - drew people in to experiment with them, especially kids. (Yes, they haven't got all that embarrassed-to-play stuff I accumulated as an adult).
Here's another one I love: The local cafe where I write (see Edison - reserve mornings for writing) has chalkboards in the bathrooms. What a fun way to express yourself and see what others are thinking.
I'm curious: What other things can you place that get people involved?