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In philosophy, that is a specific type of 'monism' called 'idealism,' the most sound form of which was espoused by George Berkeley in Three Dialogues between Hylad and Philonous (except for the part about when you aren't looking)... with a more Hermetic bent, I would recommend The Kybalion which is also a more neoplatonist form of idealism common to qabalah, chaldean oracles, gnosticism, neoplatonist, emanationist, etc.
IAO131"
Do you suggest that there is more than one truth? The Kybalion is just what I was looking for... THNAKS!