What does slumping mean?
To create an object like a bowl, the glass must bend to make the shape. Moulds in the shape of a bowls or other objects are created out of substances like clay and are used in the slumping process. The mould is placed under the glass during the firing process. If the glass bends into the mould, it is referred to as slumping. If the glass bends over the mould, it is referred to as draping or sagging.