Seeing The Brick is the Brussels based motion graphics production facility run by Maarten Vranken.

 

Seeing The Brick? 

As an in-joke, animators often included a drawing of a brick within the continuity of a drawing of a moving object, for example, a bird flying. Of Course, when an audience sees the film, it cannot see the brick as it passes too quickly for the eye to percieve but, interestingly, once an audience has been told of the presence of the brick they observe the image much more closely.  

(Paul Wells, Understanding Animation)