A 1974 kids book featuring loveable, furry old Grover, it's sort of a companion to The Monster at the End of this Book. Grover visits the Everything in the Whole Wide World Museum and sees the Long Thin Things You Can Write With Room, the Light Things Room, and so on. Does the museum really contain everything in the whole wide world? You'll have to read the book (still in print and a great deal at $3.25) to find out.

Highly recommended; now that I know it's in print I'm going to get it for my 2-year-old daughter.