Through the square window.

Harry laughed when he encountered  mathematical windows on the Jungle Parc climbing experience at Lydiard Park today. The climbing routes are rated green, blue, red and black, as per the ski runs...and he was able to complete them all. So, ... happy boy. (I was quite happy too!)
We then had a play in the playground, a slide around on the bouncy castle slide - see extra - and rushed home for his 
swimming lesson. Only 2 children turned up, so almost like a private lesson. H was very impressed and declared it the best lesson EVER! Very intuitive for a 7 year old.