throwaway219450 7 hours ago

There are odd visual illusions though, like humans perceive the Wagon-Wheel Effect even though there's no obvious reason it should happen. This is the effect where the speed of a rotating object varies depending on its sync with a discrete exposure period.

https://en.wikipedia.org/wiki/Wagon-wheel_effect

https://research.tue.nl/en/publications/subjective-strobosco...

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qqewqe123 7 hours ago | parent [-]

You mention it yourself, these illusions only occur with "discrete exposure periods". This is moreso related to video recordings and less about how the eye sees actual physical objects. Such illusions do NOT occur with natural light.

Edit; to be clear there is a version of the wagon wheel effect under natural light, I'm just saying that the main one with discrete exposure periods does not occur irl

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1718627440 6 hours ago | parent [-]

What? Have you never looked at another car's wheel on the highway? Or is that something that only occurs to some people (doubt it).

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autoexec 6 hours ago | parent [-]

Eye vibrations can cause the effect to be visible to the naked eye. If even humming can do it, the road vibrations might too.

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1718627440 6 hours ago | parent [-]

I'm confused. I thought seeing/measuring lower frequencies due to a low sampling frequency, where the lower perceived frequency is basically the modulus of the real frequency and the sampling rate, is a well-known phenomenon independent of the actual sensor implementation.

	▲	autoexec 5 hours ago \| parent [-]
		I guess it is, but it's unclear why it happens outside of recordings. https://www.livescience.com/32406-what-makes-wheels-appear-t...