Just a quick note here for the folks who are (a) not on Twitter and (b) not following Talking Math with Your Kids.
I created a shapes book for all ages. The digital version is free for now. Details are in this post over at TMWYK.
Buy the book version
Common Core Math For Parents For Dummies—a handbook for curious parents and others—is out now! Priced at under $10 on Amazon. The real Frustrated Parent has endorsed it. I am not making this up.The Talking Math with Your Kids Store
You can buy tiling turtles, pattern machines and my book Common Core Math For Parents For Dummies, (with more items coming soon) at the Talking Math with Your Kids Store
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Overthinking my teaching 
Love this! So simple, so elegant. Can’t wait to try it out with my PSTs and my own children.