Just what is existence?

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Just what is existence? I see it this way. The past is only an abstract thought. It is only in your mind because it has already happened. It is intangible. It cannot be 'held' or 'changed'. The future is also an abstract thought, it hasn't happened yet. It is only in your mind that it exists. It cannot be 'held', either. The present is an infinitly small amount of fleeting time between the future and the past. Infinitly small - it really doesn't exist at all. So is life a dream? Is it only in your head?