Set of six clear glass tumblers with optical base effect, Italy, 1970s

A set of six Italian tumblers from the 1970s, crafted from clear glass featuring a distinctive optical refraction at the base. The tumblers have a classic silhouette that tapers gently toward the base, ensuring a stable grip and comfortable handling. The optical effect emerges from the thickened glass at the bottom, creating shifting reflections that change with the viewing angle. Italian glassmaking in the 1970s combined centuries of craft tradition with new optical and geometric experimentation. These tumblers are versatile for both everyday use and formal occasions. Each tumbler is 14 cm tall with a 7 cm diameter. The set is in good condition, with no significant flaws.