"Kinetic art" - a term coined in the early 1960's, refers to art that has mechanical parts that may be set into motion.  It is an appropriate name for this great mid-century entry - it seems the parts could all be set into motion in this Thomas Glenn Holidays ornament.
The "Kinetic" Ball Ornament
Part of the Mid-Century collection
Handcrafted in Poland
Made from glass
Approximately 4 inches tall (10cm)
Includes original manufacturers box and packaging
Made by Thomas Glenn Holidays