Even if nowadays visual recording is dominated by graphic computer programs and digital camera, manual drawing of geological structures is not luxury but still necessity. Drawings prove their strength where computer-generated sketches and photographs fail: They serve for quick and simple documentation in the field or at the microscope. They leave out, emphasize and document the main features while the camera only provides a large 'data salad'. They can specifically be applied as a 'language' of its own, can be flexibly adapted to the requirements of documentation and...