Imagine if you had overlapping sensations which meant you heard a word and saw a color, or associated color with days of the week or letters or numbers? How much richer would your life be?

One in four people experience just this, synesthesia, but most are unaware that it's unusual as it does not impair them in any way. In fact, many find it a positive trait that enables them to be more creative in art, music, literature, and memorize information or names and places.

Author and synesthete Elizabeth Thomas Rook is keen to draw attention to the wonderful and interesting world of synesthesia that has remained a little off-radar until recently.