Make a diorama for them that is very detailed so that they can feel the area before the sunset, whether it be a beach setting, which you can take them to when the sun sets so the can feel the changes in the weather and light prisms or in the woods do one with field/woods and trees and use REAL material. Ask them what there personal best feeling of beauty they have and just enhance it for them. Take them on the same day to a sunrise and then a sunset in the same place so they can hear and feel the differences. Do that a few times then take them to another place for the sunrise and sunset so they can smell the difference's too. Good luck, we dont know how fortunate we are that we can see this let alone be able to describe it too.
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Allow them to touch your face. Their touch will tell them plenty about you. Versus how you describe them using words. Of course, ask them if they wish to do this. Also if you aren't comfortable doing this. then don't do it. Also ask them how they learned to describe what people look like without using their sight.
Tell them that it is a wonderful thing and is warm like a fire. That light is the opposite of coldness. That light is something almost magical. I hope that this really helps you, and good luck!
There are various methods to do this, but always remember that since the blind person cannot see, she must be able to relate the answer to something that she has touched previously.
A cloud is a tiny bit difficult, but try this. Explain that clouds are "wet", but that they are above us in the sky. They look like cotton scattered above us when they are not raining. When they are getting ready to rain they are dark, dirty looking cotton...or fiber fill from inside a pillow.
Frequently a blind person is not totally blind but can distinguish between light and dark. If this is the case, the cloud difference can be explained that way; the difference between light and dark.
Fog was much harder for me to explain. I explained to my friend that fog was cold wet "steam" that you could not see through. She had "seen" steam, so that explanation satisfied her.