| This model was proposed by Witten and Sander to simulate certain types of aggregation - for example, metal ions diffusing through a fluid and sticking to a charged electrode. |
| Many objects formed by aggregation have the same branching, wispy appearance, which led Witten and Sander to hypothesize that some macroscopic features of these aggregation processes can be simulated without reference to the specific forces involved. |
| They developed the DLA model from this motivation, and computer simulations of DLA produced aggregates looking much like the physical objects. |
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