Chicken or egg?

Which came first - the chicken or the egg? A sign of gamification of smoking, near a university somewhere in London (maybe Bloomsbury?). Neat idea. Discourages litter, encourages debate. And possibly also smoking. The chicken seems to be winning.

Philosophical wall

"All greatness is precarious" (Plato, I think). Sign on a wall in Glasgow. Apt for the building it's on, which is beautiful but in need of attention.