Before allowing E to start playing, I set two ground rules: 1) All items need to stay in the bin or on the tablecloth, and 2) Nothing from the bin goes into your mouth. I turned her loose, sitting on the ground with her for about the first 10 minutes. She asked a lot of "what is this for" questions, to which I would give answers such as, "This is what I can think of to do with it. What can you think of?" I then went to work on other things for a while and allowed her to keep playing. I liked how she came up with ideas for the object I never did (used the rose as a bean stirrer). I loved that aspect of this bin!
The only rule we may need to add for the next bin (depending on the contents) is that feet do not go in the bin. E wanted to step into the bin to see how the rice and beans felt on her feet, and I allowed it. She loved having her toes buried in the filler and wiggling them out.
Since I initially put the bin out for E, she has asked to play with it numerous times. I can't wait to plan and introduce the next bin!