Francis Galton's Inquiries Into Human Faculty and its Development features what is thought to be the first colour image of synaesthetic visualisations.
This is just an automatic copy of Public Domain Review blog.
Francis Galton's Inquiries Into Human Faculty and its Development features what is thought to be the first colour image of synaesthetic visualisations.
Source: https://publicdomainreview.org/collection/synaesthesia-diagrams-1883