Light Net consists of 40 spotlights equipped with movement sensors suspended as a ceiling. Each light is spaced on a 3m x 3m grid, 8 lines by 5 lines, creating an overall field 24m x 12m. The lights and detectors are focused precisely, so that each light and detection circle is tangent to the next, never overlapping. As a person passes into the domain of each light, it illuminates for five seconds. Depending on how quickly a person moves across the field they leave a trail of lights of different lengths behind them. The bulbs themselves are muted, creating a calm and festive feeling in the open space but also refer to surveillance and security issues.