That'd make it a diagonal image on the ground, though. It looks like he's changed the actual image being sent to the server in some way.
Those were actual bricks, though. I had originally made my T in a single server preview, and what I found out was that the top of the image is south-west, and the bottom is north-east. With (0,0) being the center, from top to bottom there are 300 1x1s. From left to right, despite it looking like a square image, there are 200 1x1s.