Is there an eraser tool in Powerpoint?
To add to what everyone else has said, note that PowerPoint uses "Drawing"
tools, not "Painting" tools. With drawing tools, you have object that you
can move around on the screen and modify their properties. With painting
tools, you have no objects, just a bunch of pixels. That is why you can have
an eraser tool with painting because you are simply erasing some pixels
(just like taking an eraser to a piece of paper).
--
David M. Marcovitz
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/
Microsoft PowerPoint MVP
Associate Professor, Loyola University Maryland