I think that many of us wrote the primes, pi, e, Fibonacci, etc. stuff as our first computer programs, and it *WAS FUN*. I'd not deprive a bright 13 year old of such fundamental experiences. Graphics, bah humbug! I went to one of the fifth grade classrooms in Papert's study. They programmed in Logo, and one of the students showed me a program for computing the sums of consecutive powers of 2. I commented that it was interesting that the sums added to something very close to the next power of 2. The student was surprised and said it wasn't true. We began looking at the list. Somewhere, up around 25 digits, it was my turn to be surprised. Some random digit that should have been a 5 was a 7. The student was relieved to see the contradiction and immediately forgot the whole discussion. I never did find out how the error crept in, but it was probably a mechanical defect in the printer. Mathematical truth can be elusive in a physical world. Hilarie