Awesome responsive design by Stuff and Nonsense
stuffandnonsense.co.uk
stuffandnonsense.co.uk
Because people don't go around resizing web pages. They open it in one size (namely: as big as possible), and pretty much leave it there. And if they do resize it, it's not to see it change.
I'm not trying to crap all over the design itself. It looks good. I can only assume it addresses their target audience. And I can appreciate the benefits of having a single set of HTML/CSS that scales to all sizes.
Being a design firm, their use of eye candy works for potential clients who may not be too technical, yet realize there's this need for "making my web look good on my phone and computer" (as one former client once said to me).
And it's pretty nifty eye candy too. It's the first time I've seen someone change an illustration based on a viewport size. Not groundbreaking, but a pretty neat idea.
Oh, and to address your question about who would ever resize their browser to see this - only developers would do that. These could be developers working for their potential clients, which means this eye candy can be a good conversion tool.
End users wouldn't resize browsers like this, of course. An end user would see just one of the illustrations, depending on which device they used. On an iPhone, they get the thinnest illustration. On an iPad and some laptop browser windows, they get the middle illustration. On large screens, they get the largest illustration.
I don't think so (not that the design isn't good). But it's even a little awkward at the smallest size, because you see a transitional animation whenever you load the page.
I wish more sites would at least think a little about this sort of thing. I like to keep my browser in a small window if I can, just to let me use other apps along side it on my desktop machine. Unfortunately all too many sites just look awful unless you give keep the browser window large...