Even though the artistic drawing says everything but asserts nothing, the architect’s sketch constructs theories. The former unveils some of the truth, while the latter is an investigation of the roads leading to the truth. The sketch is a private affair; it is only as beautiful or ugly as handwriting. If need be, the architect puts it down on paper, but it is mostly brought to life in virtual space. The architect distils sketches down to figures and diagrams so that afterwards houses can be chiselled out of them.