h a l f b a k e r y
Not so much a thought experiment as a single neuron misfire.
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A reasonably-sized mechanical arachnid, featuring large-bore hypodermic-tipped legs, that slowly wanders around the lawn injecting water a few inches beneath the surface. The result is a more robust lawn, as the roots dig down to get to the water, with no direct evaporation.
Normally powered from
the garden-hose connected to its butt; controlled by solar-celled chippery.
Once or twice a year, set to a different program and with the electric high-pressure pump operating, it can blast aeration holes into the surface.