TikTokers with synesthesia have stirred up a trend linking colors to names. And now, even people who don't have the condition can get in on the action. According to Psychology Today, synesthesia is a ...

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.