This applet adds transfer of the slabs between the two stacks. The applet [color=#535353]was originally [/color][color=#535353]suggested [/color][color=#535353]by Steve Phelps - "[/color][color=#535353][u][url=http://www-beta.geogebra.org/m/3137147]Figure[/url] [/u][/color][color=#535353][u][url=http://www-beta.geogebra.org/m/3137147]6.7[/url] [/u][/color][url=http://www-beta.geogebra.org/m/3137147][color=#535353][u]Cavalieri's principle[/u][/color][/url][color=#535353]" [/color][color=#535353]and enhanced by Anthony C.M. OR -[/color][url=https://www.geogebra.org/material/simple/id/3139423][color=#666666][u]Cavalieri's[/u][/color][/url][url=https://www.geogebra.org/material/simple/id/3139423][color=#666666][u]Principle[/u][/color][/url][color=#535353]. [br]I would like to thank Anthony OR for contributing to the design of this applet.[/color]