The Tenth Dimension 

 The semester is about to start, which means it is  math camp  time at the Government Department. The very first topic is usually an introduction to dimensions, starting from R1 (lines), to R2 (planes), to R3 (3D planes), to R4 (3D plane plus time). Here is a nice  flash animation  (click on “imagining ten dimensions” on the left) that takes you a step further, from zero to ten dimensions in less than 5 minutes (including cool visual and acoustic effects). It doesn’t necessarily become more graspable as you ascend ... :-)