What is incredibly curious about this is how clear the text looks on the camera screen. Why is that curious? Because it's almost impossible to read the text in real life!
The map you can see has been designed by computer (see http://www.bluedust.dontexist.com/lego/ for the HOWTO), which produces some rather bad aliasing effects around the text. When you photograph it, the computer acts like an un-alias, making it legible.
Tip: if you want to make the text more legible to humans, but don't want to hand-design the font, then strip the image into two parts - one graphical, one textual. Then you will get an font that's aliased only against black & white, which makes it easier to read.