From Jerry McCarthy
Noreen Weighell thinks of numbers in colour thanks to kindergarten teaching methods (9 February, p 33). I experience a similar crossing of the senses derived from an early enthusiasm for electronics. I see numbers, particularly road numbers, in their resistance colour code values. So the A272, for example, appears to me as “red, purple, red” – the first three coloured stripes on a 272 ohm resistor.
Wokingham, Berkshire, UK
