From Noreen Weighell
I was intrigued that letter writer Amy S. Bouska associates 9 with the colour yellow (19 January, p 30). For me, 9 is always a cool blue; 5 is yellow; 7 a sinister black; and 4 my favourite pink. I am not a synaesthete, but in kindergarten I learned to associate 1 to 10 and their squares with specific colours, so 16 is also pink. We used Cuisenaire rods – bars of coloured material cut to appropriate lengths to represent single digits.
Ampthill, Bedfordshire, UK
