What can go up a chimney down, but cannot go down a chimney up?

the cone shaped thing with a stick in the middle that can be many different colours canopy designed to protect against rain or sunlight. designed to protect from the sun ASWELL ; Often the difference is the material; some are not waterproof. are often meant to be fixed to one point and often used with patio tables or other outdoor furniture,wich is a hand held object AKA AN UNMBRELLA :) HAHA