The other day my 4-year old daughter asked me if I could make a small car for her. I said yes, sure, tomorrow we can think of something. No, not tomorrow, she said, I want it now. But now it’s almost bedtime, don’t you think? And she said, well, I guess you’ll have to make it really fast.
So I did.
Cubodelubo 
Great work, so simple so wonderful!