Great for developing intuition in geometric proofs

I recommend this for parents and for teachers. It develops great intuition for geometric properties and logic, appropriate for kids and adults. I recommend it to my community college geometry students, and my 3-year-old also loves it. How's that for range? (To be honest, my 3-year-old will get more out of it when he gets a little more dextrous. It's probably more appropriate for 5+)