| Euklid: The elements (ca. 300 B.C.)
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| Euklid: The elements (ca. 300 B.C.)
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| Arnheim: Visual thinking (1969) | |
| ... makes the sketch moveable (in mind) |
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If one angle becomes greater, the other has to become smaller.
Sketch moveable with DGS:
We do not disregard the size of the angle, we survey all sizes!
We get a dynamic concept instead of a static one.
