The blocks world is a classical planning model of movable blocks arranged in stacks on an unlimited table. Each block has one support, each block supports at most one other block, and the support relation has no directed cycle. A clear block can move onto another clear block or onto the table. In a direct-transfer STRIPS representation, an action includes the entire pickup-and-placement operation; a separate holding or empty-hand planning fluent is unnecessary unless the action model explicitly splits those operations.
The table has unlimited capacity, so its availability must not be deleted when a block is placed there. Planning state invariants connect the predicate describing a clear block to the absence of any block directly above it. Goal interaction in planning makes this small model useful for testing automated planning methods.
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The Blocks World is a classic problem in the fields of artificial intelligence and robotics, often used to illustrate concepts in planning, problem-solving, and algorithms. The scenario typically involves a set of blocks that can be stacked on top of each other in a two-dimensional space, usually represented as a table or a surface. In a typical Blocks World scenario: 1. **Blocks**: There are various blocks, often distinguished by color or size.