A very unusual 1960s-80s Czechoslovakian Exbor blue, colourless and green cased 'Monolith' vase, designed by, or after designs by, Pavel Hlava, unmarked, 27cm high This very scarce and highly detailed form is extremely challenging to make. Using cutting and the properties of the material of glass to great success, it offers incredible optical effects depending on the angle it is viewed from.