Best to start them early. Redditor Pypok and his wife needed a theme for their son's nursery, and Pypok suggested space (by way of Kerbal Space Program). Turned out rather well, I'd say—perfect for a future space explorer. There are some in-progress photos in the embedded Imgur album below.
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That's awesome! I've been using Hearthstone to help my 1st grade daughter with addition and subtraction math. #CoolDads