This chapter delves into the concept of synesthesia, discussing different types of synesthetic experiences such as auditory visual, grapheme-color, and mirror touch synesthesia. It explores studies that reveal the correlation between specific tones and visual or geometric experiences. The chapter also discusses the hypothesis that synesthesia lies on a continuum and how it may relate to aphantasia.
For some people the number six is red and music evokes a range of colours and shapes. Seeing sounds and hearing colours is one type of synesthesia—where the senses are crossed. Meet an 11-year-old girl who was surprised to find out that not everyone sees colourful auras around people, and who feels that numbers have colours and personalities.