I never quite understood the concept of computer equipment designed in
 such a way that stacking things on top of it was difficult or
 hazardous.  Don't manufacturers realize that it's difficult to stack
 things that aren't shaped for stacking, and that stackability is
 helpful for saving space, which many of us are short on?  The worst
 offenders seem to be those new Macintoshes, in assorted
 colors... those should win an award for the worst computer design of
 the century; in order to make one of them useful, one would have to
 build a wood frame, or somesuch, around one, which one should be able
 to deduct from the purchase price.
  
Its because you're NOT supposed to stack stuff on top of the monitors.
Since people cant seem to grasp that simple concept, the manufacturers
have to slope the tops more and more. the heating vents on the top
should have given you a clue as to why they dont want books and papers
stored there...
-Lawrence LeMay