Venn

Draws every possible region whether or not anything falls in it. Two circles make four regions, three circles make eight, and each one gets a place on the page before you know what is in it. That is the point. An empty region shows up as an absence you can see, rather than as something that was never drawn.

Draws every possible region whether or not anything falls in it. Two circles make four regions, three circles make eight, and each one gets a place on the page before you know what is in it. That is the point. An empty region shows up as an absence you can see, rather than as something that was never drawn.

Example

Best when you have two or three sets and you want the empty combinations to be visible.