We set up the homemade wooden (regulation-size) teeter in the backyard again, after having it in the garage all winter. I wanted Wall-e to know that the teeter moved so that he wouldn't be surprised if he went on it while playing in the backyard, so I decided to teach him the teeter. WOW, he really did surprise me!! He learned the teeter in less than five minutes! Well, it's set at only 18" now so it's not full-height yet, but he can run right to the end of the teeter and wait there until it hits the ground, then wait until I release him with an "Okay!"