The kettle that floats
Anil is in the second hour of a two-hour still-life test. He has arranged a white enamel kettle, a green glass bottle and an orange on a grey cloth, lit by a single window from the upper left at about 45 degrees. His drawing is neat but flat: the kettle has a bright highlight on its right side and no cast shadow; the bottle is filled with solid dark green and outlined with a white line; the orange has a black shadow. His entire drawing uses only three values, and the kettle looks pasted onto the cloth rather than sitting on it. The paper is 25 x 35 cm, the light is not moving, and he has 55 minutes left. He wants to know whether to start again or repair.
1. Identify the light-logic errors in the kettle, bottle and orange, and state the single rule that resolves all three.
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Kettle: the highlight is on the right, which implies light from the right, but the window is upper left. The lit planes should be upper-left, the core shadow lower-right, and a cast shadow should fall to the lower right. The kettle also has no contact shadow, so it floats.
Bottle: solid dark green with a white outline treats glass as an opaque solid. Glass is read through transmission, refraction, a dark edge, a bright specular streak and a cast shadow that carries a little transmitted colour. A white outline is a symbol, not an observation.
Orange: a black shadow is too dark and too neutral. The shadow side should contain a core shadow, reflected light from the cloth, and a cast shadow that is darker at contact and lighter farther away. Black also kills the orange hue in the shadow.
Single rule: every value and edge must be consistent with one light source. The terminator separates lit from unlit form, and the cast shadow is the object's silhouette projected along the light ray onto the supporting surface. If the highlight says upper left, the cast shadow must say lower right; if the cast shadow is missing, the object will float no matter how well it is shaded.
2. Design a seven-value tonal plan for the whole still life, assigning roles to the kettle, bottle, orange, cloth and shadows. Explain how the white kettle can still read as white.
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Use a seven-step scale, with 1 as the lightest paper and 7 as the darkest accent:
- 1: reserved paper, used only for the sharpest specular highlight on the kettle and the bottle.
- 2: light planes of the white kettle and the orange's top plane.
- 3: general body tone of the white kettle; this is already off-white, not paper white.
- 4: mid-tone of the grey cloth and the orange's local colour.
- 5: core shadows on the kettle, orange and cloth folds; also the bottle's dark edge.
- 6: cast shadows on the cloth and the bottle's transmitted dark green.
- 7: contact shadow under the kettle and orange, and the darkest accents in the bottle neck.
The white kettle reads as white because it is the lightest large shape and because it is surrounded by darker values. If the whole kettle is left as bare paper, it competes with the highlights and looks chalky. Keep the body at 2-3, let the shadow side go to 5, and reserve 1 for a small specular spot. The same principle applies to the orange: its local colour at 4 will look more saturated if the shadow goes to 5-6 and the highlight stays at 2, rather than if white is mixed into every tone.
3. The window is an extended source, not a point. Explain how this changes the kettle's cast shadow and how Anil should render its edge in the time available.
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A point source gives a hard-edged shadow. A window has width and height, so different parts of the window see around the kettle and produce a penumbra: the shadow is sharp and dark at the contact with the table, then softens and lightens as it moves away. The shadow also widens slightly with distance rather than staying a perfect silhouette. At a 45-degree light angle the main shadow length is roughly equal to the kettle's height, but the soft edge is part of the observation.
Render it in three zones: a dark contact shadow at value 7, a firmer umbra close to the base at 6, and a graded penumbra at 5 that fades into the cloth. Do not outline the shadow. Use cross-hatching that becomes more open and lighter toward the outer edge, or blend the outer zone with a stump or fingertip while keeping the contact sharp. With 55 minutes left, Anil should repair rather than restart: correct the highlight, add the contact and cast shadow, glaze the bottle rather than repaint it, and reserve the last 10 minutes for unifying the values.