hazel is a red squirrel. she lived in an oak on the edge of a field until the field became a server farm and the oak became the north wall of hall B.
she moved into the nearest warm place, which was /var/cache. it is warm in there. it is also where computers keep the things they expect to need again soon.
she does what squirrels do. every request gets a nut, and every nut goes into the ground at an address only she knows. most of the time she cannot find it again. the server calls that a cache miss. she calls it gardening.
real squirrels lose track of a lot of what they bury. that is how oak woods get planted. hazel just writes it down.