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I feel the colours.. strange or?
What colour is the letter "A"? What does the number '1" taste of? Does listening to music, speaking or eating food produce colours, shape or texture? For most people, questions such as these will either yield a look of bewilderment or an emphatic "No!"
Synaesthesia is often described as a joining of the senses. Sensations in one modality (e.g. hearing) produce sensations in another modality (e.g. colour) as well as it's own. Synaesthetic experiences are often driven by symbolic rather than sensory representations, such as letters, numbers and words. It is also often experienced in the absence of external sensory input, such as one's "inner speech".