In the 19th century, they called it “colored hearing”—letters and words, when spoken, took on mental weight and shimmered with color in the mind’s eye. For Miss C., who was interviewed in 1892, “n” ...

When you hear the word love, does it taste like fresh ink and soft paper? When you see the number 4, does it burn a deep orange in your mind's eye? Does the letter E glow lime green above the page ...

People with color-grapheme synesthesia experience color when viewing written letters or numerals, usually with a particular color evoked by each grapheme (i.e., the letter 'A' evokes the color red).

How many times a day do you sing the alphabet to your little one? Probably more times than you can count, right? With ABCs come 123s, and because children learn through repetition, you’re probably ...