It does not happen very often that I see a demonstration of a new technique and say something like “Wow, give it to me, NOW!” immediately after it finishes. This is one of the times that it actually happened. The real problem with images on websites is that they are more or less static. The webmaster selected a size for the image and this is the size that you see when you visit the page and it does not matter if you have a very small screen or a big one.