American artist Phillip K Smith III has installed coloured lights along a skybridge in Detroit, which illuminate in various gradients and patterns at night.
The Detroit Skybridge project reactivates a disused pedestrian walkway that links two towers in the Michigan city's downtown area.

The 100-foot-long (30-metre) bridge was designed by Gino Rossetti of local firm Rossetti Architects in 1976, to connect the 16th floors of the Guardian Building and One Woodward.
Based on the modernist aesthetic of the latter, completed by American architect Minoru Yamasaki in 1962 and featuring a white concrete facade, the skybridge is formed of a simple shell with windows running along each side.

Smith's intervention involved adding LED lights behind the translucent panels, so they shine through as blocks of colour.
The lights are programmed to change in patterns, creating the impression that the hues are moving along the length of the bridge. Single-colour bars and rainbow effects are also among the configurations.

Smith described the project as "a beacon for the beauty, creativity, and innovation of Detroit".
It was completed with the help of local gallery Library Street Collective, and supported by Bedrock Detroit, Quicken Loans Community Fund and Wayne County.
"Detroit Skybridge is an example of how under-utilised spaces can be reimagined for the benefit of the public," said Anthony Curis of Library Street Collective.

Smith is best-known for his use of mirrors ...