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What matters is how clearly you imagine the scene you project into. By imagining it, you create the environment, so it doesn't matter if it's a picture hanging there or an image projected on the wall. However, if it's a picture which has been hanging there for some time, then probably it is already strongly imprinted in the astral because you see it every day, so it already has a real existence. If it's a new image, then it won't be so strongly imprinted and so a little harder to project into.... (imo).