This paper discusses the common recognition of music and colour from the viewpoint of synesthesia. The focus is especially placed on coloured hearing synesthesia. Coloured hearing synesthestesia experiences a crossing of senses where a brain recognizes music aurally as colour. An experiment, in the format of questionnaires, was conducted where subjects were required to listen to music and select a representative colour for the music. The analysis of the questionnaires obtained the following results: it suggested that synesthesia exists at a subconscious level in human beings and that synesthesia is caused by influences of common recognition of music and colour associations.
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