I can invent dreams or open the skies. It's easy to use me, just close your eyes. What am I?

Answer: imagination

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I can kill people, or cause great pain. You eat me. I can mean you’re crazy. I hold things together. I help climbers stay safe. I can replace a swear. And I’m on a violin. What am I?
I can never be stolen from you. I am owned by everyone. Some have more, some have less. What am I?
I can only be played on a windy day. What am I?
I can run but not walk. Wherever I go, thought follows close behind. What am I?
I can run constantly without ever getting tired. When I run, I frustrate people and drive them crazy, Yet I don't even have to move to irritate you. What am I?
I can sing, but I can't talk. I can climb a high tree, but can't run. I have very soft hair and a very hard mouth. What am I?
I can sizzle like bacon. I am made with an egg, I have plenty of backbone, but lack a good leg. I peel layers like onions, but still remain whole. I can be long, like a flagpole, yet fit in a hole. What am I?
I can speak with my hard metal tongue. But I cannot breathe, for I have no lung. What am I?
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word. What am I?
I can the same written do forward, backward, and upside down. What am I?
I can travel from there to here by disappearing, and here to there by reappearing. What am I?
I can wake you up in the morning but I require no electricity or winding. What am I?