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 representation, and they can combine information and arrange information in relation to specific needs. Last but not least, making drawings raises the ability of observation and contributes to the understanding of geological structures and the structure-forming processes. Geological drawing is assisted scientific thinking.