 Complete the following phrase:  Much of Libenský and Brychtovás architectural work was done for buildings in Czechoslovakia, including two windows, created for the St. Wenceslas Chapel in Pragues St. Vitus Cathedral. Built in the fourteenth century, the historic chapel was reconstructed by the Czech government between 1961 and 1964. Libenský and Brychtová were selected by competition to replace the chapels original stained glass windows, which dated from 191213. The artists created an abstract design for the windows that, in its modern simplicity, departed from the ornate, early sixteenth-century decoration of the chapel. To relate the new to the old, Libenský and Brychtová used the muted grey-brown, grey-green and pink hues in the chapels frescoes as the predominate colors in their windows. Outside of Czechoslovakia their architectural glass work was seen in Worlds Fair exhibitions and Czech Embassies. At 