Light

You may associate light with power.

You may associate light with delightfulness.

You may associate light with knowledge.

You may associate knowledge with enlightenment.

You may even associate knowledge with delightfulness.

But do you ever associate civility with light?

Perhaps you associate civility with the Earth's atmosphere, both literally and figuratively.

The atmosphere prevents a considerable amount of dangerous radiation from reaching the surface of the Earth.

What do you know about ultraviolet?

What do you know about visible light?

What do you know about the electromagnetic spectrum?

What do you know about colour?

 What do you know about light in relation to time?