Which inanimate objects do you greet? There have always been trees in my life that I've been particularly courteous to. Mt. Rainier will often get a respectful nod from me. If the moon is especially brilliant I'll say hello, and Orion will almost always get a genial "How's it hanging?" out of me. It just seems polite.
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Usually it's whenever it's a case of mild surprise, actually, come to think of it. Like whatever it is has said hi first; I'm just returning the greeting.
I can't believe I've never heard you say that to Orion.