The man sees colours for numbers

I met an accountant recently, who told me that whenever he thinks of numbers or he sees numbers, each number is a colour or a combination of colours. I'd heard about this in a documentary I watched about the world record holder of reciting pi to about 30,000 digits. Fascinating. Also, he said that about 50% of the accountants that work in his company are ambi-dextrous, which was unexpected.