It is a well-known fact that an object can be projected on two different planes, which are symmetric with respect to one of the straight lines of projection, as mutually congruent images projected by a oblique parallel projection. However, we can not find yet the proof of this fact from a viewpoint of the axonometric projection. The author gives a geometric proof of the above fact, also shows new formulas related to the image plane, the line of projection and the axonometric axes and, moreover, a few of their applications.

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A revised face method in multidimensional graph analysis is proposed, where the faces concieved by Charnoff H, is based and modified in order to develop the method in various phenomena even such as catastrophy. The mainly revised points for the present method are as follows;
i) Male and female are created independently.
ii) To be younger or elder can be distinguished.
iii) The direction of a face is added by showing details of a nose.
The process of drawing the faces is described and the psychological test results are shown by expressive aspects of the face.
The method indicates that the revised faces are applicable to the more delicate display for a human's emotion.

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This paper discusses a three dimensional geometrical modelling and processing program developed for computer graphics education. This program has such listed abili-ties; (I) Generaion of primitive bodies, such as a cube, cylinder, cone, sphere, etc. (2) Transformation of bodies, such as affine transformation, revolution and parallel movement. (3) Display of bodies. This includes hidden line elimination. (4) Calculation of cutting lines and intersection lines of bodies. (5) Generation of shades and shad-ows of bodies. This program does not use variable length data and it represents bodies with polyhedron. Having such abilities, the number of steps in this program were reduced to about 1500.

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The following paper is an extension of the stereo principles used by Kondo and Tajima in their article in the Journal of Graphic Science of Japan, No.28, p.1. These basic ideas are well-known in their simple form as stereograms, and have been adapted as hyperstereograms by Brisson for the American Association for the Advancement of Science Annual Conference in Washington, D. C. in 1978. However, the work of Kondo and Tajima is interesting and well conceived. A particularly interesting aspect of their work concerns the arrays of stereographic elements that they have generated. They have produced the basis of stereo effects from single image construction. This paper is a discussion of some of the possibilities of that aspect.

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