There is a tendency for art work to present a kind of puzzle which the viewer attempts to solve; often in such cases, once the art is understood, it has lost its challenge and therefore its interest. Mel Bochner’s art reverses this operation; one immediately gets Bochner’s work, and at that point the real interest begins. At the Hartford Art School, Bochner showed Nine Demonstrations From the Theory of Sculpture: Counting. The Nine Demonstrations are similar to work shown in New York last year. White pebbles are placed in certain relations on the concrete floor on which corresponding numbers,