Kopecký deprived glass of its tendency towards primary attractiveness by brutal intervention of colour, destruction and combination with other materials such as wood, cardboard and metal (Search, Space 3 event, Všemín 1986) In the installation in the Prague Castle Ballroom in 1999, where black colour dominated, evoking feelings of frustration and loneliness, the dangerous and hurtful sharp edges of the glass stood out from the black mass. Despite all the relentless attack, however, Kopecký's glass remains a material with a perceived essence of fragility and vulnerability.
