History of glass
Glass remained a luxury material, and the disasters that overtook Late Bronze Age civilizations seem to have brought glass-making to a halt. It picked up again in its former sites, Syria and Cyprus, in the 9th century BC, when the techniques for making colorless glass were discovered. The first glassmaking "manual" dates back to ca. 650 BC. Instructions on how to make glass are contained in cuneiform tablets discovered in the library of the Assyrian king Ashurbanipal. In Egypt glass-making did not revive until it was reintroduced in Ptolemaic Alexandria. Core-formed vessels and beads were still widely produced, but other techniques came to the fore with experimentation and technological advancements. During the Hellenistic period many new techniques of glass production were introduced and glass began to be used to make larger pieces, notably table wares. Techniques developed during this period include 'slumping' viscous (but not fully molten) glass over a mould in order to form a dish and 'millefiori' (meaning 'thousand flowers') technique, where canes of multicolored glass were sliced and the slices arranged together and fused in a mould to create a mosaic-like effect. It was also during this period that colorless or decolored glass began to be prized and methods for achieving this effect were investigated more fully.
Cocktail glass
Despite a popular story that says the martini glass was invented during Prohibition so that in the case of a raid on a speakeasy, the large rim allowed the drink to be easily disposed of, the martini glass was formally introduced in the 1925 Paris Exhibition as a modernist take on the Champagne coupe, and wasn't originally used as it is today: in films of the 1920s it is shown to be used to hold champagne, like the coupe. However, despite the design taking influence from the geometric aesthetics of the eras architecture, interiors and furnishings, it was designed less for aesthetics and more for functionality - with the longer stem reducing the warming effect of body heat upon the contents of the glass, and the widened brim increasing surface area, supposedly allowing the gin, the main ingredient in martinis, to release its bouquet. Steeply sloping sides prevent ingredients separating, and also serve to support a toothpick or olives on a cocktail skewer.