Giant Crayon, a scientific observation

Why do kids like these giant blow up toys? They love it. M won this Crayon somewhere and treat it like a treasure. Last night she left the valve opened and this morning she needed to re-inflate it. After awhile she commented to me that something is holding the air in. I encourage to examine the valve more closely. She found the one-way mechanism but not quiet understanding how it would work just yet. I told her we will work on it this evening and she needs to draw up what she find in her journal. Everything is a learning opportunity, I always say. If you would only pay attention to the children.