If a tree casts a shadow is it telling the time?
<|reference_start|>If a tree casts a shadow is it telling the time?: Physical processes are computations only when we use them to externalize thought. Computation is the performance of one or more fixed processes within a contingent environment. We reformulate the Church-Turing thesis so that it applies to programs rather than to computability. When suitably formulated agent-based computing in an open, multi-scalar environment represents the current consensus view of how we interact with the world. But we don't know how to formulate multi-scalar environments.<|reference_end|>
@article{abbott2006if,
    title={If a tree casts a shadow is it telling the time?},
    author={Russ Abbott},
    journal={arXiv preprint arXiv:cs/0603125},
    year={2006},
    archivePrefix={arXiv},
    eprint={cs/0603125},
    primaryClass={cs.MA cs.GL}
}