Are you bored of sensing things in the same way they've been sensed for the history of humanity? Have the known forms of interacting with computers lost their flair? Is an insufficient auditory neurosystem bogging you down? Then I think I have the project for you. Why not give your ears a rest, and let your fingers do the listening for a change!
Let's prepare ourselves with some background information. Human hearing relies on a bunch of sensors in a structure called the cochlea, which, by way of a very remarkable structure, converts variations of air pressure into neural impulses. In mathematical terms, the cochlea decomposes a waveform into a finite number of dimensions, about 3600 per ear. Have you ever wondered what the sampling frequency of the ear is? It's not a very well-formed question, so to give a not very well-formed answer: from 50 to 250 Hz. Another interesting fact is that the high limit of reasonably good hearing is 20,000 Hz. Together, this means that a sensor at maximum speed is only detecting 1 out of every 80 wavelengths. This is peculiar. It would be like looking at a screen and only being able to see 1 circle every second when 80 circles are shown, and being able to tell anyway that there are actually 80 circles. How can we experience something faster than that which defines our experience? And how can we experience it as continuous when the signal keeps cutting out? With mathemagic. The cochlea's very special coiled construction is a physical, mechanical implementation of a process called the wavelet transformation, which really might as well be magic; conceptually, it's like using part of a torn picture to reconstruct the lost part.
Another key piece of this project is the tactile sensory system. It is an interesting fact that touch sensors also operate in the range of 50-250 Hz. Actually, throughout the body neurons behave in the exact same way. You can move a whole chunk of brain to a completely different spot and have it function as the piece it replaced--scientists have actually done this! As such, it is reasonable to suspect that touch receptors can convey the same information as the cochlea and in the same way, just to different places. Furthermore, some research has indicated that touch does activate some of the auditory processing part of the brain, and one of the best known properties of the brain is that it is extraordinarily adaptable. Thus, we have reason to suspect that you might actually be able to hear through touch! That is, to not just feel the vibration of sounds, like touching a speaker, but to feel sound .
With the idea in place, the rest is simple, right? All we need to do is build a vibrotactile human/computer interface and write some code to send wavelets of sound to the fingertips. The brain will never see it coming! Clearly not, because we're not working with sight (yet); the real question is, will the brain feel it coming, or will the brain hear it coming?