Google collaborated with artist Es Devlin to help London passerby contribute to an ever-evolving poem projected on Nelson’s Column in Trafalgar Square.

Cast in 1867, the four monumental lions in Trafalgar Square have been sitting as silent British icons at the base of Nelson’s Column for the past 150 years. Overnight on Monday 17 September, a fifth fluorescent red lion will join the pride. This new lion will roar poetry, and the words it roars will be chosen by the public. Everyone is invited to “feed the lion”, but this lion only eats words.

Go behind the scenes or just check out this 60-second overview:

[YouTube]