Ok, so I've got far too much time on my hands, but thought this might get people scratching their heads! The man who designed the original version of this in 1949, did so in his landlady's garage in Croydon. The original was made from parts from war surplus shops and a Lancaster bomber, at a cost of £400. When it's designer showed this to people at the LSE, they promptly offered him a teaching position. It is thought that only 12 to 14 of these machines were built, one is sometimes (or maybe permanently) displayed at the Science Museum, because of it's historical importance in the field of mathematics!