not being a fairy tale, we close our eyes and imagine the exercises, the materials, the points, the

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not being a fairy tale, we close our eyes and imagine the exercises, the materials, the points, the "lines", the figures, the solid. with time if we close well, we can even observe the figures to rotate. I say, therefore, that the descriptive geometry with geometric rigor describes what we imagine ... for five periods buy to let mortgage a method of double orthogonal projection, ie, we have two orthogonal projections of any thing, so that makes 90, are perpendicular. in the end, in the last period we have the axonometric representation (s) object (s), the introduction of the third dimension, without using special glasses, also we easily see his eyes closed.
What is this all for? so we can explain through drawing (strict) what we intend to do; so we can create with the drawing using the knowledge acquired; for we exercise the mind without recourse to an exhaustive study ... just a little game with several different levels, from those who can not play an advanced level without having completed the previous levels ...