I see clearly as you, clearer. For you it is undifferentiated. In one corner a slum collapsing, in another a new train with pistons shining, in another a gaudy painted lady below a drab and ancient airship . . . You must process as one picture. What chaos! Tells you nothing, contradicts itself, changes its story. For me each tiny part has integrity, each fractionally different from the next, until all variation is accounted for, incrementally, rationally.

Isaac had been fascinated for a week and a half. He had, typically, taken pages of notes and sought books on insectile vision, subjected Lin to tedious experiments in depth-perception and distance-vision; and reading, which impressed him most, knowing as he did that it did not come naturally to her, that she had to concentrate like someone half-blind.

His interest had quickly waned. The human mind was incapable of processing what the khepri saw.

All around Lin the duckers and divers of Aspic filled the streets on their way to scrape for money, stealing or begging or selling or sifting through the piles of rubbish which punctuated the street. Children scampered by carrying engine parts cobbled together into obscure shapes. Occasionally gentlemen and ladies strode by with an air of disapproval on their way Somewhere Else.

Lin’s clogs were wet with organic muck from the street, rich pickings for the furtive creatures peering from drains. The houses around her were flat-roofed and looming, with plank walkways slung across gaps between houses. Getaway routes, alternative passageways, the streets of the roofworld above New Crobuzon.

Only a very few children called names at her. This was a community used to xenians. She could taste the cosmopolitan nature of this neighbourhood, the minute secretions of a variety of races, only some of which she recognized. There was the musk of more khepri, the dank odour of vodyanoi, even, from somewhere, the delicious taste of cactacae.

Lin turned the corner onto the cobbled road around Sobek Croix. Cabs waited all along the iron fence. A massive variety. Two-wheelers, four-wheelers, pulled by horses, by sneering pterabirds, by steam-wheezing constructs on caterpillar treads . . . here and there by Remade, miserable men and women both cabdriver and cab.

Lin stood before the ranks and waved her hand. Mercifully, the first driver in line geed his ornery-looking bird forward at her signal.

“Where to?” The man leaned down to read the careful instructions she scrawled on her notepad. “Righto,” he said, and jerked his head, motioning her in.

The cab was an open-fronted two-seater, giving Lin a view of her passage through the south side of the city. The great flightless bird moved with a bobbing, rolling run that translated smoothly through the wheels. She sat back and read over her instructions to the driver.

Isaac would not approve. At all.

Lin did need colourberries, and she was going to Kinken for them. That was true. And one of her friends, Cornfed Daihat, was having an exhibition in Howl Barrow.