Let me show you how to achieve that Depth Of Field effect known from the photography using Gimp. With other words, how to make selected area of the photo sharp and the rest out of focus.
Truly amazing work by the NYC Grid guys creating images composed of two images at the exactly same location only decades or sometimes even century apart.
Who would have thought that already 3 decades have passed, since Bill Gates announced Windows Operating System. Check out how Windows have changed through all these years.