. Perspective for art students . representation of a hexagonal prism cut ofiabove by a sloping section. The prism is seen in planat the lower part of the diagram; it is standing on ahorizontal plane, and is at an angle to the picture. A,B, C, D, E, and P are the six corners of the work the problem by parallel perspective, we neglectthe fact that A, B, 0, etc., form a hexagon; we merelynote that A, B, etc., are at certain distances from thepicture-plane, and we regard them as the terminationsof lines, short or long, perpendicular to the picture-planeand at certain distances apart. Th
. Perspective for art students . representation of a hexagonal prism cut ofiabove by a sloping section. The prism is seen in planat the lower part of the diagram; it is standing on ahorizontal plane, and is at an angle to the picture. A,B, C, D, E, and P are the six corners of the work the problem by parallel perspective, we neglectthe fact that A, B, 0, etc., form a hexagon; we merelynote that A, B, etc., are at certain distances from thepicture-plane, and we regard them as the terminationsof lines, short or long, perpendicular to the picture-planeand at certain distances apart. This diagram, apparently so elaborate, owes its com-plexity to its being also an example of a particularmethod of working, a method which was elaboratelyexpounded by the Jesuit, Andrea Pozzo. The methodis based upon the following principles: (1) that the 84 Perspective diminution in width will be the same if the object beworked on a lower plane than it properly stands on, and(2) that the diminution in ieight will be the same on a. Fro. 57.—A method of Andrea Pozzos. line of height at some distance to the side of the object,as in the proper position. Objects in Angular Positions 85 One incontestable advantage of this method is that by-it an object standing on a plane at the level of the eyecan be represented. In the present case the object isstanding on such a plane, a plane of which the ground-line and horizon coincide. Pozzo points out that themethod not only makes such a case workable, but thatworkings very much squeezed up are avoided. In the lines cross so obtusely as to render mistakeeasy. To get out of the difficulty Pozzo assumes anew ground-plane as low down as he likes. On this hegets his figure in perspective as clear as in a birds-eyeview. The student must note that A, B, 0, etc., aremerely found as points in lines all vanishing to distance point is used to measure them with. Theworking of B is shown throughout. With the figure thus obtained on a low g
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