Walking on a beach in a remote part of the coast one could sometimes fail to notice the sand. Still, each grain (under specific conditions, like entering the atmosphere at tens of kilometers per second) can not only attract attention but also bring a smile on the face of the onlookers. A meteor!
The comparison with a grain of sand usually implies insignificance. But who says that a grain of sand is not much?
Especially when it shares the orbit with it's parent comet, like these Perseids racing with 109/P Swift-Tuttle.