Prezi is 2.5 D
its one canvas. but with zoom, we add lots of space
for your ideas. and keep the overview. no-TOC.
Its like taking your words, 
and lifting them up from the paper.
so you can put in as much of them, as many soccer fields fit on earth.

on a single sheet.
But this is nothing new - we always have built our world this way, and have explored it by moving. 

We just connected a nice walk with a nice read.