You enter your cubicle and slump into your chair.  You mentally enumerate your tasks for the day: Take minutes at departmental finance meeting, edit instruction manuals for PastaPro3000 to reflect name change from PastaPro2000, create web page for new Waffle-Max waffle iron.  On your computer monitor, you find the slow bouncing of the Microsoft icon somewhat hypnotizing.  Sometimes, you find yourself making mental estimations of how deep into the corner it will travel before rebounding off either the vertical or horizontal edge.  Do you get to work right away, or wait until the icon strikes the corner flush, so that it bounces off both vertical and horizontal borders simultaneously?