In this two-part radio series from BBC Radio 4, the condition of synaesthesia is explored through interviews with scientists and those who have been diagnosed with the condition. Synaesthesia is a condition in which the five senses intermingle, so that stimulation in one sense may give rise to a stimulation in another sense. For one example, certain letters of the alphabet may be associated with certain colors for a synaesthete. The program here is divided into two 30-minute sections. The first program explores the experiences of several synaesthetes, such as James Wannerton who tastes spoken words, and Jane Mackay, who sees shapes and colors when she hears music. The second part of the program “examines the mounting evidence that we all start life with the potential for synaesthesia." The study of this condition is pushing the boundaries of neuroscience, and this provocative exploration of this condition and its study offered by the BBC is quite engaging and informative. Listen to the show

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For the rest of us, the poor people who can't see sound, I recommend the video game REZ