-tropic, -trope Goal seeking, "turning toward" (literally "turn /
turning," but generally used to describe "turning toward,"
rather than "turning away from"). Many BEAM
robots are 'tropes of one kind or another: Phototropes seek
out light sources (these are the most common form, as
many BEAMbots are also photovores) Radiotropes seek out RF sources Thermotropes seek out heat sources
Audiotropes seek out sound sources
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