A guide is reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS9J

Visitors are reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS9D

A woman is silhouetted at the entrance of the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOSAO

Visitors are reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS7Z

Visitors are reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOSDA

Visitors are reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS7Q

A visitor is reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS8C

A visitor is silhouetted before he exits the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS9L

A guide is reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOSDC

Visitors are reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS9F

Visitors are reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOSD6

A visitor is reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOS85

A visitor is reflected in the installation Mirror Maze by artist Es Devlin, at the Copeland Park in Peckham, south London, Britain September 21, 2016. REUTERS/Stefan Wermuth - RTSOSDJ