If you don't have one of these awesome Lego Calendars...go get one! We got this one for Chomps last Christmas and it is fantastic for teaching kids how the calendar works. Each month, he and his sissy take turns disassembling it and putting it back together. And seriously, before this, I think they both thought that every month started on a Sunday. My kids are crazy for legos, but this is one set that we keep on display in the kitchen and it never gets lost.