NEGATIVE BLACK HOLE is a place at the borders of knowledge, is a place of peace and of thought. A place where space is regurarely marked by geometry, therefore measurable, congruous and tamed. But this grid is exposed to the light of three lamps that have it generate an overlapping grid, radiating from their spots, becoming a matrix for a central geometry. This installation therefore put in strict connection circle and straight line, which irreconciliability is expressed in mathematics by the undefined value of Pi Greek.