The Trousedale square

I was shown recently how to make a mitred square when knitting. I think they're ace as they're not that hard to do but look really nice. My enginering minded boyfriend took one look at it and then decided that I should be able to make it so it mitres from all 4 corners. I thought that this was total rubbish and would never work. So I set to knitting one. I had to see if it would work or not. And damn his fab 3D spatial awareness, he was right! So I present the Trousdale square. I'm sure someone else has done these before but I've never seen one and then name has stuck in our house.