An embellished blackboard drawing, it renders light as energy, but it is not one of Jensen's most vital efforts.

"As a child in grade school, I was usually the kid who was asked to do the blackboard drawings," Mr. Devlin recalled.

Steiner's blackboard drawings were unique at the time and almost certainly not originally intended as art works.

Dean has made a number of films and blackboard drawings relating to the Crowhurst story, exploiting the metaphorical richness of such motifs as the ocean, lighthouses and shipwrecks.

The papers and blackboard drawings found in a Kabul house appear to describe the Taliban's notions for dispersing biological and possibly chemical agents by balloons and other methods.

The results may be somewhat familiar; the best of these eight works can bring to mind Joseph Beuys's diagrammatic blackboard drawings or Cy Twombly's scribbled paintings.

This teacher often had the young man do blackboard drawings in the study of history and geography.

Nor did a more recent figure like Joseph Beuys, who produced his own blackboard drawings on the Steiner model and was particularly absorbed in the social and ethical implications of Steiner's thought.

The programmatic philosophy that spawned Steiner's blackboard drawings may attract a limited audience.

While he doesn't recall a clay model of the new wagon, he does remember doing a full-size blackboard drawing of it and believes a prototype was done later that Gregorie drove.