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An early example was the ERNIE machine from 1957 for British national lottery (premium bond) drawings, which worked by sampling shot noise from neon discharge tubes—and perhaps because it extracted only a few digits per second no deviations from randomness in its output were found.
And on the basis of this I spent great effort trying to see what might be wrong with the model—only to discover some time later that in fact the methodology of the experiment was flawed and its results were wrong.
Monocotyledons—of which palms and grasses are two examples—typically have only one primary site of growth, and thus do not exhibit repeated branching.
Note that a rule such as {"A" "B", "A" "C", "B" "A", "B" "D"} exhibits convergence for all paths that have diverged for only one step, but not for all those that have diverged for longer.
This principle has worked well in physics, where it has often proven to be the case, for example, that out of all possible terms in an equation the only ones that actually occur are the very simplest.
But because the only situations in which we are routinely aware both of underlying rules and overall behavior are ones in which we are building things or doing engineering, we never normally get any intuition about systems like the ones at the end of the previous section .
The most obvious exceptions are cases like rule 0R and rule 90R, where the behavior that is produced has only a very simple fixed or repetitive form.
The Relationship of Space and Time
To make an ultimate theory of physics one needs to understand the true nature not only of space but also of time.
Yet at least in the cases shown here there is still a strong average flow down the page—agreeing with our everyday perception that time progresses only in one direction.
And what this suggests is that there are quite universal principles that determine overall behavior and that can be expected to apply not only to simple programs but also to systems throughout the natural world and elsewhere.