Fountain
Version 0.21: This article may not be up to date for the latest stable release of Crawl.
Fountains are a Dungeon feature often found in many vaults. They are almost entirely cosmetic, although water-filled fountains will put out a player or monster on fire from sticky flame and create steam when fire spells are cast over them.
List of Fountains
A decorative fountain, flowing with clear water.
A decorative fountain, flowing with brightly sparkling water.
A decorative fountain, spurting with foul-looking blood.
A dried-up fountain that has seen better days.
History
Prior to 0.15, mimics could disguise themselves as fountains.
Prior to 0.14, you could quaff from fountains for various effects.
Prior to 0.12, fountains dried by the player would eventually flow again given enough time (1% chance every 20 turns), becoming whatever kind of fountain they were beforehand.