Put a person in a dark room with a single light source and, regardless of how complex we believe ourselves to be, we will look towards it.

At our latest Town Hall, our Senior Lighting Designer Homam Alkurdi invited the team to reconsider one of the most powerful tools in lighting design: contrast. His presentation, Chasing the Glow: The Art of Invisible Walls, explored how light and darkness direct attention, shape perception and quietly determine how a space is experienced.

Our attraction to light is instinctive, often taking place before we consciously understand what we are looking at. The same response can be seen throughout nature. We open the curtains in the morning to welcome daylight and the renewed energy that comes with it. Plants grow towards the sun. Moths use celestial light as a reference for navigation. In the darkness of the deep sea, the anglerfish produces its own glow to lure prey closer.

Across these examples, light becomes a source of hope, vitality, navigation and seduction. It can signal the beginning of a new day, sustain growth, provide orientation or draw us towards something not yet fully visible.

For lighting designers, this instinctive response becomes a design tool. When an object, surface or area is illuminated more strongly than its surroundings, it immediately gains importance. The eye moves towards it, while everything around it begins to recede.

Contrast therefore does more than create visual interest. It establishes hierarchy. By deciding what should be highlighted, the designer also decides what should remain quiet. Light tells the audience where to look, while darkness reduces the competing information around it.

As contrast increases, darkness begins to act as a boundary. It becomes an invisible wall, not physically present but understood subconsciously. It can isolate an object, define a zone or guide movement without the need for a physical partition.

A pool of light can make a seating area feel intimate within a larger room. A focused beam can separate an artwork from its surroundings. A sequence of illuminated elements can direct people through a landscape, an interior or a wider master plan.

Darkness, in this sense, is not an area that has been forgotten. It is an active part of the composition. Its presence gives the illuminated elements their strength.

This relationship becomes particularly clear when a space is experienced at different moments of the day. In a living room at sunset, the remaining natural light may draw attention towards the window. In another scene, an illuminated ceiling may change the perceived volume of the room. Later, the focus can shift towards an artwork, a table or a smaller area suited to relaxing.

The architecture remains the same, but the visual hierarchy is rearranged.

Lighting controls make this possible by allowing each scene to present a different reading of the space. The objective is not simply to switch more lights on or off. It is to decide what should lead, what should support it and what should disappear from attention at a particular moment.

This leads to the central idea of the presentation: the role of the lighting designer can be understood as the art of rearranging attention over the course of the day.

Lighting design is not only about achieving the correct light level or making every surface visible. It is about understanding where attention should begin, how it should move and what should remain outside the visual field.

Light attracts us. Darkness creates the boundary. The designer shapes the relationship between the two.