Since its humble beginnings in 1987, the Zwieseler Glastage have grown from a side show as part of the Zwieseler Grenzlandfest where just 30 glass artists displayed their talents, to the advent of the Glastage as a celebration of glass in its own right. Culminlating in the high point of the 25th anniversary festival in 2012, the Zwieseler Glastage are now regarded as a truly World class event.