A and E: vermilion, I: white, O: orange and so forth," says UC Berkeley French Professor Liesl Yamaguchi, author of the new book "On the Colors of Vowels: Thinking Through Synesthesia." ...

The second mode is vowel detection, and changes the lightsaber’s color depending on spoken sounds. The “ee” sound makes the saber red, and the “ah” sound turns it blue. This method ...