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Gottlob is an imperative programming language with unusual syntax created by Matthew Dockrey in 2019. It has unusual syntax, based on Gottlob Frege's logic notation from his 1879 book “Begriffsschrift: A formula language, modeled on that of arithmetic, of pure thought”. The source code is written not in plain text, but drawn as a tree in two dimensions, similar to Plankalkül or early drafts of APL. There is an implementation with a specialized interactive editor for the source code.