Bonsai Mountains
Bonsai mountains are to mountains what Roundworld bonsais are to trees: by means of careful placing of mirrors and control of wind, one can develop a miniature mountain. The very best can achieve glaciers, or even volcanism. As it is a very long process, this art form is usually performed by people with a lot of time on their hands, such as History Monks or anthropomorphic personifications. According to Lu-Tze, the trick is mainly in carefully selecting the rock on which you will work: the one that would, in a few millennia, have been at the top of the mountain.
Appearances
Bonsai mountains are not widely cultivated, due to the aforesaid time consumption. Notable appearances are Lu-Tze's bonsai mountains in Small Gods and Thief of Time.