明度、光影与形体

Focus: Value is lightness and darkness — the backbone of drawing, because we see form as light before we see colour.

• A value scale runs from white through greys to black; a 9-step scale is the classic exercise.
• Most beginners draw too light and too narrow — push the darks so the full range is used.
• High-key drawings use mostly light values (airy, soft); low-key drawings use mostly dark values (heavy, dramatic).
• Squint at the subject: squinting removes detail and shows the big value shapes.
• Local value (how light the object's own surface is) is separate from lighting (how much light falls on it).
• Control of the value scale is direct visual evidence of the AP skill light and shade.

Focus: One light source creates a predictable pattern of light and shadow — learn the pattern and any form becomes drawable.

• The six zones: highlight, light, halftone, core shadow, reflected light, and cast shadow.
• The core shadow is the darkest band on the form, where the surface turns fully away from the light.
• Reflected light bounces back into the shadow side — it is always darker than any lit halftone.
• The cast shadow is darkest and sharpest where it meets the object, softer and lighter further away.
• Shadow edges tell the story: hard edges = sharp turn or cast shadow; soft edges = gradual turn.
• Check the logic, not just the look: every value must be explainable by the light's direction.

Focus: Rendering means building smooth, believable volume — turning flat shapes into spheres, cylinders, and boxes.

• Every complex subject simplifies into basic forms: sphere, cylinder, cube, cone — render those first.
• Work dark to light or light to dark consistently; jumping around destroys the value structure.
• Blend with intention: stumps and fingers smooth values, but preserved mark-making often reads stronger than over-blending.
• Keep the lit side and shadow side clearly separated — form collapses when halftones creep into shadow.
• A drawing of white objects (eggs, cups, cloth) is the classic rendering test: value comes only from light.
• Rendered form demonstrates several AP drawing skills at once: light and shade, surface, and mark-making.

Focus: Chiaroscuro ('light-dark') uses strong value contrast for drama — the language of Caravaggio and Rembrandt.

• A single strong light against deep shadow pushes the subject forward and sets the mood.
• Tenebrism is extreme chiaroscuro: most of the image sinks into darkness, one area blazes.
• Reserve the strongest contrast for the focal point — contrast attracts the eye first.
• Charcoal and ink wash suit chiaroscuro because they reach rich, deep darks quickly.
• Working on toned paper with white and black media makes the light logic explicit.
• High-contrast studies photograph impressively — strong candidates for Selected Works.

Focus: Notan is the design of light and dark shapes — a drawing works or fails at thumbnail size before any detail.

• Reduce the scene to 2-3 flat values (a notan study): if the pattern reads clearly, the composition is strong.
• Thumbnail sketches (5-8 cm) let you test several value plans in minutes.
• Group values: many small lights scattered everywhere feel noisy; connected value shapes feel designed.
• Place the darkest dark against the lightest light at the focal point.
• A clear value hierarchy — one dominant value, one secondary, one accent — organises the whole page.
• Keep the thumbnails in your process journal: they are ideal Sustained Investigation evidence of planning.

Focus: Starting from a toned ground lets you draw both directions: darker with media, lighter with an eraser.

• Cover the paper with an even charcoal or graphite tone, then lift out lights with a kneaded eraser.
• Subtractive drawing treats the eraser as a drawing tool — pulling light out of dark.
• Toned or grey paper gives a ready-made middle value: add darks and white highlights only.
• The mid-tone start forces value decisions early — nothing hides behind white paper.
• Erasers make marks too: a dragged kneaded eraser leaves soft light strokes, a hard eraser leaves crisp ones.
• This process shows experimentation with materials and processes — exactly what the CED asks you to document.