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2. Figure drawing - Wikipedia

   en.wikipedia.org/wiki/Figure_drawing

   The artist will often start with a graphite pencil to sketch or outline the drawing, then the final line work with a pen or brush, and permanent ink. The ink may be diluted with water to produce gradations, a technique called ink wash. The pencil marks may be erased after the ink is applied, or left in place with the dark inks overpowering them.

3. Sketch (drawing) - Wikipedia

   en.wikipedia.org/wiki/Sketch_(drawing)

   A sketch (ultimately from Greek σχέδιος – schedios, "done extempore" [1] [2] [3]) is a rapidly executed freehand drawing that is not usually intended as a finished work. [4] A sketch may serve a number of purposes: it might record something that the artist sees, it might record or develop an idea for later use or it might be used as a ...

4. Perspectivity - Wikipedia

   en.wikipedia.org/wiki/Perspectivity

   A perspectivity: ′ ′ ′ ′, In projective geometry the points of a line are called a projective range, and the set of lines in a plane on a point is called a pencil.. Given two lines and in a projective plane and a point P of that plane on neither line, the bijective mapping between the points of the range of and the range of determined by the lines of the pencil on P is called a ...

5. Pencil (geometry) - Wikipedia

   en.wikipedia.org/wiki/Pencil_(geometry)

   In geometry, a pencil is a family of geometric objects with a common property, for example the set of lines that pass through a given point in a plane, or the set of circles that pass through two given points in a plane. Although the definition of a pencil is rather vague, the common characteristic is that the pencil is completely determined by ...

6. Compass (drawing tool) - Wikipedia

   en.wikipedia.org/wiki/Compass_(drawing_tool)

   The pencil lead draws the circle on a particular paper or material. Alternatively, an ink nib or attachment with a technical pen may be used. The better quality compass, made of metal, has its piece of pencil lead specially sharpened to a "chisel edge" shape, rather than to a point.

7. Technical drawing - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing

   "Parallel lines" can be drawn by moving the T-square and running a pencil or technical pen along the T-square's edge. The T-square is used to hold other devices such as set squares or triangles. In this case, the drafter places one or more triangles of known angles on the T-square — which is itself at right angles to the edge of the table ...

8. Drawing - Wikipedia

   en.wikipedia.org/wiki/Drawing

   Leonardo da Vinci's Vitruvian Man (c. 1485) Accademia, Venice. Drawing is a visual art that uses an instrument to mark paper or another two-dimensional surface. The instruments used to make a drawing are pencils, crayons, pens with inks, brushes with paints, or combinations of these, and in more modern times, computer styluses with graphics tablets or gamepads in VR drawing software.

9. Duality (projective geometry) - Wikipedia

   en.wikipedia.org/wiki/Duality_(projective_geometry)

   Thus, the dual of a quadrangle, a (4 3, 6 2) configuration of four points and six lines, is a quadrilateral, a (6 2, 4 3) configuration of six points and four lines. [4] The set of all points on a line, called a projective range, has as its dual a pencil of lines, the set of all lines on a point, in two dimensions, or a pencil of hyperplanes in ...