A fun experiment relating to the brain's ability to rewire itself:

Put your hand under one of these toys like the image: http://ubuyonline.com.au/images/toys/pictures%20018_0.jpg

Now put an object or your other hand on the other side of the pins (between the pins and the plastic). Watch your transposed 'fingers' interact with the object. Eventually you will start to feel like your fingers have actually moved to the end of the pins.

I think this is the brain rewiring itself to correlate spacial sensation to what the eyes are observing. No matter what causes this, it's an interesting sensation.