For the most part though, there is a difference of intention between the engineer and the designer; they look two ways, and the result of their collaboration is a flat and confused image of the thing that should be, not such as is produced by truly binocular vision. This difference of aim is largely the result of a difference of education. Engineering science of the sort which the use of steel has required is a thing unprecedented; the engineer cannot hark back to the past for help, even if he would. The case is different with the architectural designer; he is taught that all of the best songs have been sung, all of the true words spoken. The Glory that was Greece, and the Grandeur that was Rome, the romantic exuberance of Gothic, and the ordered restraint of Renaissance are so drummed into him during his years of training, and exercise so tyrannical a spell over his imagination that he loses the power of clear and logical thought, and never becomes truly creative. Free of this incubus the engineer has succeeded in being straightforward and sensible, to say the least; subject to it the man with a so-called architectural education is too often tortuous and absurd. The architect without any training in the essentials of design produces horrors as a matter of course, for the reason that sin is the result of ignorance; the architect trained in the false manner of the current schools becomes a reconstructive archæologist, handicapped by conditions with which he can deal only imperfectly, and imperfectly control. Once in a blue moon a man arises who, with all the advantages inherent in education, pierces through the past to the present, and is able to use his brain as the architects of the past used theirs--to deal simply and directly with his immediate problem. Such a man is Louis Sullivan, though it must be admitted that not always has he achieved success. That success was so marked, however, in his treatment of the problem of the tall building, and exercised subconsciously such a spell upon the minds even of his critics and detractors, that it resulted in the emancipation of this type of building from an absurd and impossible convention--the practice, common before his time, of piling order upon order, like a house of cards, or by a succession of strongly marked string courses emphasizing the horizontal dimension of a vertical edifice, thus vitiating the finest effect of which such a building is capable.