Stained-glass works were applied mainly in staircase windows, in door transom windows and also in rooms fulfilling executive functions. Sometimes they occurred in the form of coloured opalescent glass, colouristically arranged in geometric patterns, also with the usage of cron glass. However, they were most frequently richly decorated with allegoric scenes or motifs taken from nature. Flowers and plant twigs were a fine and willingly applied ornamental element. Top artists, whose works decorate numerous churches, designed stained-glass windows. The unique set designed by Stanisław Wyspiański for the church of Franciscans in Cracow, where the artist planned to depict four elements, of which only two were in fact illustrated, i.e. water and fire, may serve as an example. The depiction of the God the Father creating the world, which may easily equal Michelangelo's work in the Sistine Chapel, is a worldwide masterpiece.
Apart from sacred motifs in the new perspective as well as geometric and floral patterns, images of various animals or fantasy creatures, treated more humorously, were also found in stained-glass windows. Depictions of spiders, cats and parrots from Jama Michalikowa (Michalik's Cave) serve as an example of this trend.
There were also panes made of etched glass, whose interesting example from a Toruń tenement house with a portrait of a skater closes this chapter.
Unfortunately, after World War I stained-glass works became passé and were replaced with ordinary panes. A part of this fragile element was damaged in a natural way, hence, one should appreciate what has been preserved to date.