The paper is clearly divided into two parts, the first and longer one discusses concepts of "wall" in 20th century architecture, the second one reflects on the possible use of digital media to represent these concepts. The author defines five distinct aspects in which the "wall" of 20th century architecture differentiates itself from earlier concepts. This categorization seems rather naïve and even counter-productive. Discussing the examples shown from Doesburg, F.L.Wright and Mies, e.g., on the level of roof-wall-relationships does not add much to our knowledge. I would not demand art-historical depth here, but rather the opposite: to do away with the notions of roof, wall and floor altogether and treat the examples simply as visual data that can be analyzed by computer vision algorithms. The abstract drawings the author has provided would serve as a good input material for such an analysis.

Unfortunately the part of the paper concerning representation lacks any approach in this direction. The digital animations may be interesting to explain the inner logic of each type. But the typology itself could basically be done on paper. 
