Under the SUN

There are three things that we have in here. The lightwave that is coming from the sunlight, the dust particles, and open space . Normally, we see things because there is light and if these things are placed over contrasting colours. We can easily dust when they are placed over any colour. But cannot be seen by simply looking at them in an open space... unless there is sunlight that passes through them. Once a colored particle (in our case, dust), even though how microscopic it is, when lightwave that comes from the sun passes through it, it vibrates (as the word wave implies)and re-emits the same colour of the light that has passed though it, thus enables us to see it even in open space.

It is so bright when there is sunlight. that's why everything is very clear, dusts too

Yes I have noticed that, I keep my front door closed when the sun is coming in that way, you are right it really does show up the dust....:(

It may be as u can see only in light.If Its dark u cant see anything