Shu is the Egyptian god of air and light, who stands between Geb the earth and Nut the sky holding them apart, and who separates the combatants in the myths. He is the space that makes room, and when he is tired the two crash together.
Modern Practice
Shu is called on when two things need to be held apart: people, obligations, worlds. His practice is the deliberate gap kept, and the offering is incense, which is air made visible.