For the most part, it appears to Harriet that the people gathered on the corner are more interested in the posters and advertisements. It appears that the space has become a de facto advertising board: it is unclear who had come first - the people who had made the corner an impromptu meeting spot, or the adverts that plastered the wall. Her suspicions are confirmed when a large group of the gathering break away, laughing and joking as they do - the last of their company had arrived (portly man in a bowler; he takes a ribbing for being late).
The more she stares, however, the more she wonders about the graffiti. There is a pattern there, repeated and redrawn over time, locked in a constant battle for subtle exposure with the ratty pamphlets and posters that festoon, decaying, the wall space. There is something else, too: three Beasts are closing on her position. Two are rapidly drawing near, heading down the street towards her and the docks; the third is ambling more slowly, coming from the street on her right - a powerful nightmare presence, stronger than the others.
The crowd is moving aside as the motor car rumbles down the street from Nob Hill, horn honking lustily.
If Harriet wishes to follow up on her hunch, she can roll [Wits + Streetwise]