Letter: We define dimensions because they are useful

From Steven Day, Mayfield East, New South Wales, Australia

Stuart Clark asks whether there are really just three dimensions (4 March, p 31).

Weren't the three dimensions created by us as a convenient mathematical way to understand and measure spaces and to plan and construct things?

Shouldn't the question be “Can we better understand, measure, model and make things by using a mathematical method that has more dimensions than the traditional three?”