Comments by "Christian Baune" (@programaths) on "SmarterEveryDay" channel.

  1. Both eye and brain! You need low persistance and high processing speed and on top of that, not ignoring input. The brain is good to automatically filter out non essential parts to better focus on what is more interesting, mostly, what's new in your environment. It's why things in the peripheral vision tend to fade out. And if the thing you're looking at is quite diffuse, it would vanish too! The brain will simply register that it's always there and not care anymore, hence the vanishing. But the brain does even better, when we look things in the morning, at noon and in the afternoon, we are blind to color changes. The brain takes the environmental cue to correct colors! Yup, "white balance" ^^ And things can get weird, if you lookup "McCollough effect", you'll see gratings which can change your color perception for minutes, up to months! (So, dangerous for artists ^^) Vision is really a weird thing!
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  2.  @gedion4000  You can rely on line frequency or a resonator (quartz or RLC circuits). There would be almost no drift during the lifetime of the aparatus as there are no moving parts. The mecanical part need to be tuned, because of wear.
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