Stephen Wolff

A sketch pad for music, made for the iPad and Pencil. Lay a staff at any angle, place and move notes, write round them, and circle a phrase to hear it. The staff measures where each note sits and never tries to read your handwriting. Built on 2 November for Day 1; on Day 2, pen dots on a staff play too, and separate loops play in turn.

A six-piece cumbia band keeps a groove nobody conducts. Tap along and lead it from 96 to 120 BPM, or force it and watch it come apart. After Donella Meadows: get the beat of the system before you disturb it. Made on 30 October for Day 31.

A bowed string speaks cleanly only inside a window of bow weight, and the window opens with bow speed. Bow speed is the engine; weight and where you bow are the steering. Stop, and there's nothing to steer. Day 30.

A note drawn as a turning arm, watched by an observer that looks now and then, in two dimensions or only a shadow. Below two looks per turn it sees phantoms: the arm crawling, standing still or turning backwards. After Mark Burgess's Smart Spacetime. Day 29.

A sheepdog trial with up to six dogs and a whistle for each. The dogs read the sheep and pen them without you; a hands-off run of the same flock shows how much your whistles really steered. Day 28.

Listening isn't looking. A tune wanders while you listen, and each time you look it may snap back to how you last saw it. The quantum Zeno effect, by ear. Day 27.

Signing your news squeezes out the lies, and slant moves in. Whispers, the kirk door and Brandolini's law in a toy Highland glen. Day 26.