Bored. Programs showcase.

[YinYin]

Something I've really wanted to do (and I am definitely unquestionably going to do) is a tool which simulates shapes (this includes Pyraminds, Cuboids, Spheres...etc) of any n-dimension for you. Check it out, it is really interesting: http://en.wikipedia.org/wiki/Hypercube
A model of a 4D Cube (Tesseract):

I like this even better to get a grip on the 4th dimension: http://www.superliminal.com/cube/applet.html
(you can turn it any way you like on your own rather than having it auto rotate on just one axis)
Well those are just projections of 4D objects as 3D objects on a 2D plane, which is very far fetched. Cool still.

Offtopic: So I had this crazy idea from the fact that the 3DS uses 2 camera's to record 3D videos. The idea is: MAYBE, having a 3rd eye would've allowed us to see shapes in 4D (and so having a(n) x number of eyes can let us see things in x+1D).

A 3rd eye would only allow you to see 4D if it also were at a different position in 4D space than your other 2 eyes (which are at different positions in 3D space).
The only 4th dimension we can actually perceive though is time - and having access to a third eye at a different time doesn't really sound biologically possible.