In 1950, Ušinskas began scientific and technical experiments with stained-glass formed a low-temperature and was the first in Lithuania to produce mirror and block stained glass. Ušinskas, already known for his work in the interwar period, was forced by circumstance and a loss of commissions to begin experimenting at the Aleksotas glass factory, where he set up his own small workshop equipped with a small, liquid fuel-fired furnace. There, he created low-fire fine glass works: vases, plates, aquarium bowls, lamps, and small glass figurines.
