This paper introduces Code Lisa: a collaborative programming environment
in the browser that allows users to program one cell in a grid of cells.
The cells can react to each other, but also to the environment,
represented by sensor values on an EV3 Lego Mindstorms robot. By
programming reactions to each other and to the sensors, a group of Coda
Lisa users can together create a living, interactive art work. Users
their cell in a live editor created for this purpose, which shows a
preview of the cell's behaviour. Once ready, the cell's program can be
submitted to the server so it can be rendered in the shared grid of
cells, by a second Coda Lisa client application: the viewer. In addition
to the implementation of Coda Lisa, this paper also describes several
plans for future development.