Rudolf Steiner's blackboard drawings

Steiner lectured with coloured chalk on black paper laid over the board. An assistant thought to keep them. Some 1,100 survive, and they are looked at now as drawings rather than as notes.

A cosmology drawn in real time in front of an audience and then thrown away — except that it was not. They are the closest thing in this wing to seeing a diagram being made rather than reproduced. Af Klint met him twice; he told her the work would need fifty years before anyone could read it.