In addition, the Middle America Trench, a major subduction zone lies off the Pacific coast.

As Juan said, it's the condition that scientists call synesthesia, an unusual cross talk between the senses.

In 1666, Isaac Newton observed the Sun's light using a prism, and showed that it was made up of light of many colors.

Daniel Tammet has linguistic, numerical and visual synesthesia meaning that his perception of words, numbers and colors are woven together into a new way of perceiving and understanding the world. The author of Born on a Blue Day, Tammet shares his art and his passion for languages in this glimpse into his beautiful mind.