If you look at a digital clock or any other display like that and roll your Rs or vibrates your lips, the digits seem to vibrate violently as well while nothing else in your vision moves. Why does that happen?
In: Biology
As you roll your Rs, your head vibrates. This makes everything you see appear to vibrate. You only notice it in whatever your vision is focussed on, which in this case are the digits of an alarm clock. Also, because your brain knows the entire room isn’t vibrating, but knows something is vibrating, it tricks itself into thinking what you’re focussed on is vibrating.
This is all speculation btw.
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