Multidimensional sense and sensuality:
Hearing Colors And Seeing Sounds: How Real Is Synesthesia?ScienceDaily (July 26, 2007) In the psychological phenomenon known as "synesthesia," individuals' sensory systems are a bit more intertwined than usual. Some people, for example, report seeing colors when musical notes are played.
You do know that synesthesia is not an ordinary condition, right? It’s a problem with the brain wrongly interpreting signals that it receives from various parts of the body.
Nice to see you’re doing the research, though. Look it up in YouTube, there are some good videos there.