here's an article about how some mathematicians have started to visualize the 4th dimension. we're still exploring the 3rd/4th dimensions while there are believed to be a total of 26 dimensions out there! DAAAAAAAAAMN! while we cannot name/describe most of them, mathematics have proved their existence in the world around us. the video and pictures are pretty cool
http://www.sciencenews.org/view/generic/id/35740/title/Seeing_in_four_dimensions
http://en.wikipedia.org/wiki/Dimension
http://www.sciencenews.org/view/generic/id/35740/title/Seeing_in_four_dimensions
http://en.wikipedia.org/wiki/Dimension