I read that the Ainur "dressed" themselves in bodies similar to those of Eru's children. They could at anytime take off their bodies and be something like transparent spirits. Olorin (Gandalf) used to be among the Elves in this state. Atleast that is what the Silm says.
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To win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the acme of skill. ~Sun Tzu
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