For some reason, the pictures on page 31 are slightly out of focus. That may because the matted pictures you see on that page were in a PowerPoint slide.
The magazine's artist pulled them out of the slide, added some shadows behind them and overlapped the images. It makes a nice collage, but the pictures lose a little in clarity.
If you're curious about the photos in the collage on page 31 of the article, I took all but one of the pictures myself. Starting at the top left and going clockwise they are: Prospect Park in Brooklyn, NY; the Bundy family circa 1900 (this is the only one of the grouping that I did NOT take!); a view on Mount Lemon near Tucson, AZ; the Maroon Bells near Aspen, CO; my girls a few years ago; and downtown Chicago on a foggy night.
I've written a follow-up article, which is coming out in the next issue of the News with more information about how to do the matting with ovals and shapes. I hope you find the instructions clear and easy to follow. Since you're already a computer user and reading this blog, you may find it easier to do the matting than some of the other DH readers.