svoboda became the principal designer at the czech national theatre in 1948 and held that position for more than 30 years. his multimedia installations "laterna magika" and "polyekran", realized together with director alfréd radok and his brother emil on the occasion of the expo 58 in brussels, allowed him to be internationally known. these productions introduced the combination of live actors and filmed projections. svoboda is also responsible for introducing modern technologies and materials such as plastics, hydraulics and lasers into his designs. in 1967, svoboda created one of his best known special effects, a three-dimensional pillar of light. this was created by the use of an aerosol mixture which revealed low-voltage luminaries.