A friendship ball is a hollow sphere of plain or striated glass hung in cottage windows in 20th century North America as an act of friendship. European art glass balls for holiday decoration are commonly referred to in Austria and Germany as kugels (balls or spheres). Kugels range in shape and styles, according to the artist that made them and the season they are displayed. It is quite common to display egg shaped kugels at Easter and heart shapes at Valentines day. Quality kugels are hand blown art glass. Most are blown into an apple wood mold to retain shape and consistency, though some artists free blow their kugel designs, thus ending up in an irregular shape. Air bubbles and other imperfections are common and expected by the collector. In North America these glass balls are marketed as witch balls, spirit balls, spirit catchers, friendship balls, gazing balls, wishing balls, each with associated folklore.
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