This is a question that just arose out of curiosity. So my MacBook Pro has 1440 x 900 resolution, but when I switch it to, say, 1024 x 768, the pixels are all there. Are the pixels that flexible that they can just morph into different densities? Or does the software just enlarge anything on the screen? I.E. a 400 x 400 image on a 1440 x 900 res screen would be enlarged to something like 500 x 500 on a 1024 x 768 res?