“… The second castle (after Castle Turing) was built on the slope of a mountain and had an elaborate irrigation system in which water from a bubbling spring was routed through a system of gates. There were many thousands of these gates, and they were connected to each other in small groups, so that one gate’s opening or closing would, in some way, affect that of the others in its group. This castle grew its own food and was suffering a terrible famine because the arrangement of gates had in some way become fubared. A dark, mysterious knight had come to visit the place and apparently sneaked out of his bedroom in the middle of the night and fiddled with connections between some gates in such a way that water no longer flowed to the fields. Then he had disappeared, leaving behind a note stating that he would fix the problem in exchange for a large ransom in gold and jewels. Princess Nell spent some time studying the problem and eventually noticed that the system of gates was actually a very sophisticated version of one of the Duke of Turing’s machines.

Once she understood that the behavior of the water-gates was orderly and predictable, it was not long before she was able to program their behavior and locate the bugs that the dark knight had introduced into the system. Soon water was flowing through the irrigation system again, and the famine was relieved.”

( Apologies for plopping down the entire bucket. )

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And, when thinking of how to divert and control the incoming tide, I was reminded of the falling sand game: http://chir.ag/stuff/sand/

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I think having a few tools could help your designs have more uniform shapes, straighter lines, rounder towers, smaller details, etc.. Then players who aren’t necessarily skilled artists can end up with a castle that isn’t totally lopsided.