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A bowl is the structure that holds cannabis flower. You smoke the bowl by lighting the flower with a lighter or match. Some bowls are built into a pipe, like the push bowl on a GRAV® Spoon. Push bowls are indentations in a pipe formed by pushing a tool into the glass while it's soft. Other bowls are separate components with standardized joint sizes intended to fit a variety of bongs and bubblers. Component bowls can be removed while smoking in order to clear the water pipe with fresh air. They can also be more easily cleaned and replaced when broken. Component bowls are sometimes known as "slides", due to the fact that they're slid in and out of a water pipe during use. A bowl is also a unit of measurement, referring to one bowl's capacity for plant matter (as in "hand pipes should be cleaned after every tenth bowl smoked").