He was wandering around the lantern searching for something on the ground.

A passerby observes him, notes that he must be drunk, and asks him what he’s looking for.

“My keys” answers the drunkard.

Seeing nothing on the ground, the passerby asks if he’s sure that he lost them there.

To this, the drunkard then answers “no, I lost them over there, but it’s too dark to see anything”.

That’s how blind spots work. It’s uncomfortable to go there.

People avoid them and thus haven’t explored them.

By keeping that state for long enough, everyone gets into the habit to look elsewhere.

After a while, they even become unaware of the possibility that it’s possible to look elsewhere.

The blind spot fulfilled its mission. It disappeared out of sight.