Kan & Li
Blending Water and Fire
Introduction
The simplest description of water & fire is that, in a person, usually the fiery energies are above - and tend to burn out through the top, and that the watery energies are below - and tend to leak out the bottom. In the kan & li practices, the fiery energies are brought under the watery and a kinder blend occurs. The water is refined and raised - and is less likely to leak, and the fire is nourished and anchored - and is less likely to flare.

the usual: fire over water the blend: fire under water
While the practices do start out as simple and distinct as that, the blending continues over and over; richness and subtleties continue to develop and emerge.

Essays, References
Contains explanations of the trigrams for water and fire (pg. 22 of the introduction), and of the hexagrams for fire over water (hexagram #64) and fire under water (hexagram #63).
Tsongkhapa's Six Yogas of Naropa
The classic text, from the Tibetan tradition.
S.Biel's Fire and Water technique.
This is a gentle - yet profound - way to integrate the heart and sexual energies, that doesn't produce the pressures in the body that Kan & Li proper does.
"Lesser Kan & Li" and "S.Biel's Fire and Water Technique" comparison.
a simple, yet deep, breathing method.
From HT-USA Discussion site post #5439, Title - Re: Kan & Li, Fusion and the Tiger and the Dragon
Lesser Kan & Li (suitable for viewing on-screen, 88k):
Lesser Kan & Li (suitable for printing, 108k):