“I use this action of erasing newsprint to link erasers and newspapers together,” she says, “discovering that they both have a kind of ‘intermediary’. When I use an eraser to wipe a newspaper, it is both erasing newspaper ink and painting with the colours absorbed by the eraser, which is magical.”

Erasers are extraordinary in her eyes – having worked in tutorial centres and children's art studios, she often saw piles of used erasers adorned with scribbles. She observed that when rubbed over a long period of time, they would toughen until they became almost stone-like. Then, she discovered that erasers could also absorb newspaper ink.

Through this process of seeking common ground while preserving differences, Cheung discovered the possibility of transformation in things: “When erasing newspapers, I found that the ink colours of the newspaper would transform, turning into the colours of plants or retaining walls in nature and the city,” she says.