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Blocks world
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<p>The blocks world is a <a href="/facts/Automated_planning_and_scheduling/VL1TcrmD">planning domain</a> in <a href="/facts/Artificial_intelligence/lJGauQwX">artificial intelligence</a>. It consists of a set of wooden blocks of various shapes and colors sitting on a table. The goal is to build one or more vertical stacks of blocks. Only one block may be moved at a time: it may either be placed on the table or placed atop another block. Because of this, any blocks that are, at a given time, under another block cannot be moved. Moreover, some kinds of blocks cannot have other blocks stacked on top of them. </p><p>The simplicity of this toy world lends itself readily to classical <a href="/facts/Symbolic_artificial_intelligence/ACBwbcG6">symbolic artificial intelligence</a> approaches, in which the world is modeled as a set of abstract symbols which may be reasoned about. </p>