it basically means you have your perception "crosswired" for some of them numbers have a colour, or smells a shape or colors a sound or a haptic sensation "added"
it's not halucinatory random, so for a single synaesthetic who percieves lets say numbers in colours and therein a 2 as prussian blue and a 7 as green this connections won't change.
for such a person it is from within their perception a hard fact that 13 is brown, or a guitar sounds silky and a violin plushy etc.
some make money off that (as kenny sure knows) -> Kandinsky
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