What the folding lines on the cutouts should be?
2. If we optimize the design using the maximum visual similarity to the prototype represented as criteria, and forgetting about the building technology for a while, are the folding lines on the cutouts needed at all? I’ll start from the second question. Imagine a uniform colored object with flat surfaces (a polyhedron for example) and mentally unfold it, producing a cutout. No fold lines are present on the flattened cutout. But when we look on the object, we will see its edges as lines, defined by the sharp changes of its illumination in those places. So we see the edges as LINES and we are able to recognize the same object in a line drawing of its isometric or perspective projection. In our mind it exists as a uniform colored object with sharp lines with contrast (let’s say black) hair lines on its edges. It is due to the image processing in our mind that is part of the object recognition and classification process that our brain performs. The part of this process is 2-D image differe
