Below is the new Sonos logo.
When you scroll up and down with the image on screen, it looks like sound waves are pulsing outward.
What causes this effect to occur?
It’s called a Moiré pattern.
It forms when two ‘grid’ patterns (loose term that could apply to geometric lines, dots, etc.) are overlaid with each other and moved.
In this case, the two ‘grid patterns’ are the image, itself (which is geometric lines) and the pixel based screen-refresh of your screen.
A similar effect is when newscasters would wear tightly striped patterns on TV: https://www.youtube.com/watch?v=jXEgnRWRJfg