I loved the Little Lulu stories, where she would fantasize that her bedroom rug would turn into a pool of water, and she could dive down into the center of the world.
A molcajete is a stone mortar and pestle from Mexico. They're great for grinding spices and making salsa and guacamole because they give everything a nice coarse and rustic feel. I've never collected anything, but I think I might start collecting these because each one is decorated differently.

