This latest animation from Norman McLaren and Evelyn Lambart takes letters and shows how, with the slightest of alteration, they are transformed into numbers and it goes on to illustrate just how easily we can make words, numerals and equations from essentially the same symbols. It also quite entertainingly demonstrates the concepts of (sometimes a little agitated) arithmetical symmetry too, and creates quite a clever closing page that just about adds up! It's a simple, but a remarkably addictive eight minutes that does challenge your brain a little.