Being a cross sensory experience bearing strong emotional impact synestheisa has immense persuasive value. In addition itcan often be very subtle, even subconscious, this could be why some experiences feel eerily profound affecting us more deeply that we suspect. Therefore, when creating an environment or product synesthetic considerations can be greatly beneficial.
The Artist, musician and Synesthete Michael Haverkamp has made the study and practice of synesthesia in design, as well as in art and music, a crucial part of his work. Much of his work has not yet been translated into English, though two articles Visual Aspects of Auditory Perception and Synesthetic Design and Sound Quality which have can be downloaded from his website:
http://www.michaelhaverkamp.mynetcologne.de/synaesthesie%20engl.htm
His site also holds other treasures to be discovered see and enjoy
