what they sell is a custom type absinthe of absinthe glass known as the Slipstream — a drinking absinthe glass that holds i.e.and cold water in one chamber situated above sugar in another, and the absinthe in another chamber below that, all connected to a glass straw. it’s a clever gadget that facilitates what absinthe aficionados call the louche, a methods by which the alcohol-soluble herbs such as anise and fennel and oils of wormwood, are slowly drawn out by cold water and emulsification.