Researchers and experiencers have long struggled with defining the hard-to-wrangle trait known as synesthesia. And media attempts are even worse. I'd like to take a stab at advancing a more complete, ...

Vladimir Nabokov first noticed, at age 7, his special gift of synesthesia when playing with colorful alphabet blocks that "were all the wrong color." Source: Contributor: Neil Overy/Alamy Stock Photo.

What do Billie Eilish, Kanye West, and Lorde have in common, besides being famous musicians? They all share the same neurological condition, synesthesia, which may play a part in their artistic ...