I guess it's people coming out from the darkness of consumerism/materialism and returning to mother nature...and blue skies and peace await on the other side. The bell a reminder that time is running out and we can't continue polluting and epxloiting the planet as we've done. the infnity symbol to remind us the planet can last forever if we take care of it.
Looks like it could be a mural by , but I'm not sure.
RE: Street Art - London (Bermondsey)