If you haven't already treat yourself to some time at Jeffrey Bell's blog, in which he delves into affinities and differences between Spinoza and Leibniz. His latest is on Spinoza and OOO. It's really wonderful fresh stuff. Makes you feel good to be alive, really.
The machine above was invented by Leibniz in 1671, and it can do simple calculations when you crank it by hand. It's an upgrade of a machine invented by Pascal in 1646.
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