I wonder how the non-random color patterns in the pictured LEGO build came to be. Maybe he’s not 100% blind?
From what I can tell in the image:
2x6: white
2x4: blue
2x2: grey
This makes interesting patterns, since you are more likely to use certain bricks in certain positions.
As the other comment mentions, it might be due to brick size, but also note that many people considered blind still have some non-zero vision (just e.g. extremely blurry, or a tiny field of view etc.). Although this guy had a glaucoma at the age of six, so there would be extremely little left by now.