Duchamp was less the provocative Dada artist but more a calculating strategist playing with delay whose works were for sometime without significance. [...] Most importantly his Readymades, however they will be interpreted in the future, are disturbances with changing content. One must not exhibit them in a museum isolated and without commentary. In summarizing the Twentieth Century, as well as looking into the future, the virtuosity of Duchamp's achievements is one of the most exciting chapters not in the least because his theory proves, once more, that it is the onlooker who makes the works.