Stroboscopic effect (lighting)

The stroboscopic effect happens when a light is turned on and off really fast, like blinking really quickly. When this happens, our eyes can't see the light turning off and on, so it looks like the light is on all the time. But when something is moving really fast, like a fan or a spinning top, our eyes can see that it's in different positions each time the light blinks.

So, the spinning object looks like it's moving slower or even still, even though it's actually moving really fast. This is because our eyes are playing a trick on us! It's like watching a movie made of pictures that change really fast - the pictures blend together and our brain thinks it's seeing motion even though it's just a series of still images. The stroboscopic effect is used in lots of different ways, like in disco lights or in slow-motion videos.