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Because most multiplexed displays do not present the entire display simultaneously, they are subject to "break up" if the observer's point of regard is in motion. For example, if the observer were to rapidly swing their vision across a multiplexed display, they might see a jumble of individual digits rather than a coherent display. This effect can also sometimes be provoked by chewing hard candy; this causes vibration of the user's eyes, leading to the break-up of the display.
Nope, he's not being weired at all !It works for me too...I'm not a scientist but I can tell that the vibrations caused by the raspberry making lips are reverberating through my skull along and or onto my eyeballs causing them to jitter rapidly and thus what is viewed is also jumping too !Try it with just your lips if your pierced tongue won't allow for raspberry blowing fun !
My husband claims that when he blows a low raspberry whilst watching TV, the picture goes wavy and looks odd.