Why is the Milky Way often described as resembling spilled milk?

It resembled spilled milk

The name originated from ancient observers who perceived the faint, pale band of light arcing across the night sky and thought it looked visually similar to spilled milk. This effect occurs because the perspective is aligned toward the center of the galaxy along the plane of the disk. From this vantage point, a vast number of distant stars and interstellar gas clouds are blended together, creating a soft, continuous glow rather than distinct points of light.