The finding of a secret lost door gives us the opportunity to talk about things that are inside other things. For example, we play the Grocery Game with Mr. Salt and Mrs. Pepper. This involves placing various food items on shelves based on what's inside them. We also get to skidoo into a pull tab book, where we find many interesting things inside the tabs.
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Whenever Steve opens a paper bag, the pawprint comes out. When he closes it, the pawprint disappears.