"Remove the work from the precise place on the streets that he put it, and the work instantly loses its power. Context is everything."

Such gaps make it extremely hard to provide precise information about likely impacts.

The implications are four dimensional, complicated, disrupting – and the precise reactions and consequences of those reactions are largely unknowable and unmappable.

But many of the ascendant streaming services and smart TVs allow advertisers to be far more precise — down to picking specific individuals to serve ads to.

Amorim's side have been leaking goals at an alarming rate, 41 in 30 games to be precise.