Moritz Stefaner wrote about my Ph.D. thesis, The Language of Graphics: "I think it is a fantastic piece of work. [...] A great achievement [...] analytically really strong and I believe also quite novel in this form." Thank you, Moritz! Dave Gray calls this thesis "the most thorough exploration and synthesis of visual grammatical forms I've ever seen." Lucas Reehorst reviews it as "Very impressive… razor sharp analytic… tackling the subject of visual languages… painstakingly untangles the cobwebs of elements". The book itself is out of print, but it can be browsed and 'full-text-searched' here and downloaded here.