Oliver Leššo´s (1973) work reflects the tradition of pure geometrical shapes and technical perfection of the Slovak glass art from the 1970s, but in a more emotional way. He found his expression not only in optical glass, but over the years he has developed a special kiln-cast technique, which has became his artistic trade mark . He fuses pieces of glass rods, each blasted in to a particular grain, in a mould which results into a net like pattern structure inside of the cut and polished objects, defining the internal space. His objects are characterized by the contrast between the minimalistic surfaces and dynamism inside, mat and transparent surfaces as well as tinted and pure glass. The whole technological process behind Leššo´s glass art is not only extremely time-consuming, but also requires a great deal of practical experience and state-of-the art equipment. 
Some sculptures have been elaborated over a period of several years, with the artist revisiting them throughout.