The subway tunnel linking <a href="https://en.wikipedia.org/wiki/King%27s_Cross_St._Pancras_tube_station" class="extiw" title="en:King's Cross St. Pancras tube station">King’s Cross St Pancras Underground station</a> with One Pancras Square on King’s Boulevard. The 90m long lightwall is displaying a design called "Pipette".
<a href="//commons.wikimedia.org/wiki/User:Colin" title="User:Colin">Colin</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>