Libenský and Brychtová pursued original directions in their sculpture throughout their long career together. Although they explored many different forms and colors in glass, they continued to focus on the way light can be manipulated in the glass mass. Their sculptures are cast in a technique called mold melting, in which chunks of glass are allowed to soften and melt into molds inside a large kiln. After the firing is complete, the sculpture is gradually cooled and then carefully cut, ground, and polished.