Modelling sculptures: form and volume with light and shadow

Using directional light purposefully

Use directional light to shape rooms, objects, and sightlines deliberately. Select the beam angle and beam direction to suit the task – in other words, match the size of the light cone to the size of the exhibit. This is how you direct attention precisely. Position the luminaire with care. Lighting from the front, i.e. from the viewing direction, tends to create a flat impression. Light placed to the side of the sculpture produces a stronger contrast between light and shadow.

Rule of thumb

With directional light, take your cue from our natural experience of daylight. Bring the light in from above or from the side. Avoid light from below if the effect is to remain natural. For directional accents, choose a warmer light colour than for the diffused general lighting. The light then appears familiar and convincing, like warm sunlight as accent lighting in contrast to cooler skylight as the base light. If you want to create striking, theatrical effects, you can use light directions and colour temperatures that depart from the museum angle. Only consider downlights where the distance to the wall is small. They can achieve the desired angle but often produce visible scallops – parabolic patterns on the wall.

Choosing the right light spectrum

Before deciding on a light colour, examine the material and the surface, and define the effect you want to achieve. Cool white light colours suit metal, concrete, or glossy objects. Warm white light suits fabrics, wood, or leather. The right choice renders colours authentically, emphasises the qualities of the material, and enhances the impact of the artwork.

Rule of thumb for colour rendering

For analytical viewing, choose lamps with excellent colour rendering so that even the finest colour differences of the exhibit or the room surfaces become visible.

For emotional viewing, on the other hand, choose a light colour that matches the lighting in the artist's studio. Coordinate the background deliberately with this: its colour can intensify the luminosity of the exhibits. Colour rendering should not be assessed by calculation alone. Ra or TM-30 provide important indications, but they are no substitute for a visual check on the object itself. Trial-light artworks directly in the space. This is how you can tell whether material colours, surfaces, and details really do look authentic.

Diffused light for sculptures

If you want a calm presentation of sculptures, choose very wide or diffused light distributions. Reduce shadows, harsh contrasts, and strong accents. Keep in mind the effect on material and form: diffused illumination casts hardly any shadows and models volumes only weakly. Avoid using diffused light exclusively on glossy surfaces. Without directed light, brilliance, depth, and high-quality reflections are lost. Abstract chrome sculptures presented beneath a diffused luminous ceiling can, however, look highly aesthetic. In some situations a luminous ceiling is the only right solution. To achieve more modelling and brilliance with luminous ceilings, it is advisable to add accent lighting. This makes contours, textures, and material qualities vividly visible.

Modelling sculptures with light at 30°

Direct the light onto the sculpture at an angle of around 30°. This creates directed shadows that clearly model form, depth, and surface. Use spotlights for this purpose. They set precise accents and make glossy materials look sophisticated.

Modelling sculptures with grazing light

If you want to emphasise surfaces strongly, use light at a shallow angle of incidence of around 5°. Grazing light reveals fine textures, reliefs, and traces of the material. The intense cast shadows model even the smallest irregularities. Examine glossy surfaces particularly carefully, as grazing light can cause reflected glare. Assess uneven walls critically: extreme shadows can make imperfections more visible than intended.