The reason why synaesthesia works is because what we want to recall is associated with a striking landmark. Landmarks don’t have to be limited to the five senses. They can be anything emotional, shocking, funny, unexpected, silly, embarrassing, or outrageous. That’s why people can recall precisely what they were doing at the time of shocking news events, such as the assassination of John F.Kennedy or the death of Diana, Princess of Wales. It’s also why we never forget our first day at school, a beautiful romantic holiday, and our first teenage kiss.