Samer_Web

Responsive icons
It dosen't mean that the width of the screen determines how big an icon is displayed, actually it means that a different icon is displayed based on the size it is presented in.
This means that screen size does not matter but the size of the icons itself does.
This is because some icons will be displayed in various sizes – at the same time, on the same screen.
The difference between icons won’t be anything more but the quality of detail displayed.
We are talking about having a lot of detail in an icon which is displayed big at say 500px by 500px, a little less detail for an icon which is displayed 250px by 250px and as little detail as possible for an icon that is only 25px by 25px in size.
I’m sure you can image that a single icon would look boring and even render poorly if you have very extensive icon and displaying it very small.