I'll add to this list all those taps that can be activated without a direct
manipulation of an object, such as passing your hand in front of a light ray
which causes the water to start flowing.
The objects being manipulated in this case are photons.
Maybe you are being needlessly pedantic or "splitting hairs" (getting lost in the
minutiae of details), I'm not sure. But I think asserting "if there is a valve (and there are
many sorts of valves), it's a tap" is fairly clear.
I think your definition is perfectly good. I was just pointing out that
other kinds of devices using valves exist that don't always require
manipulation of any object.
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