Mario characters appear on brick walls

I painted a color on the wall of a brick and seemed to have a picture depicting a Mario character. Since Mario itself is a dot picture, it is certainly possible if one brick is regarded as a dot.

So let's see the marioes that appeared on the brick wall. Details are as follows.
It's Knuttz - Mario's Walls

There seems to be similar in the walls of other universities.

Mario.jpg (JPEG image, 307 x 343 px)

Also, some are made with the same reasons using pins.

Willyspankit: John has too much free time