I have the answer for you! Just follow my step by step instructions for hours of happy childhood memories:
1. Find yourself a box. Look for a nice big one like the ones large appliances come in. (Call a store that sells them and they often will save them for you or tell you where to pick one up, I've done it multiple times.) Bring it home. Set in in the coolest room of your house.
2. Obtain a copy of Christina Katerina and the Box.
3. Read said book to children.