No. 015, in seventeen platesPeekaboo

Peekaboo is a single joke told seventeen ways, and it lands every time. A Siamese cat, inked in fine comic-book line with seal-brown points and cream fur, pops into a field of flat red. The red never changes and neither do the eyes: huge, round, glossy, fixed on whoever is holding the phone. The only variable is how the cat has arranged itself to get your attention.

Some hang their chins over a ledge, both paws gripping the edge. Others lean in from behind a door frame, one arm stretched across the screen towards you with the toes spread. A few have given up on dignity entirely and lie upside down, paws in the air. In one plate a cat waves over a white bar like a commuter hailing a bus; in another the head pushes through a square hole, pink claws out. Several plates are close cousins, so pick the pose that suits your mood that week.

The cats nearly always enter from the sides or the lower half, leaving the top third of the screen as clean red. That is where the clock goes, and black or white numerals both read clearly on it. On the Home Screen the red is loud, so white labels are the safer choice; the face tends to land around the middle rows, which makes it fun to leave a gap in your icons for the eyes to look through.

For cat people, Siamese owners in particular, and anyone who likes a phone with a sense of humour and a strong colour. Sideways Hello, Over the Top, The Reach and Paw Pad peek out free in full resolution; the other thirteen cats are premium.