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"When we create diagrams, we keep a couple of things in mind. We want to be clear, and we don't want to invent anything. Maybe it's obvious what I mean when I say we want to be clear, but I'll elaborate a little. It means we want to eliminate superfluous detail, and we want to establish a clear visual hierarchy." More..
Using modularity-- little icons accumulate to represent numbers.
Using flowing lines to show connections between events and people.
