Create a device that measures the temperature of the water being emitted by your shower. Shower heads have standardized connectors, so it should be easy to produce a device that goes in line (in series) before the water goes to the shower head.
The standardized connector also allows easy creation of a valved T junction sending shower output to a garden hose, which also has a standardized connector.
The moral of the story is, interesting things become possible with standardization.
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