Idealism may be nothing more than the realisation that what you are is entirely stationary, not that it happens to be so, but that it is essentially so, or better that it is stationarity itself - incompatible by nature with any form of movement or change. That means that everything taken to be experience is the only appearance of movement, and that it is all moving at the same rate. The illusion is that you can measure movement within experience because some parts are moving more slowly than others. That thinker or subject that seems to move in relation to a relatively stationary background or world or context of being, is actually in perfect synchronisation with that background; if the subject is made out of thought then so is the object, the context and the thinking too. This is what is behind the movie analogy. Some parts of the image seem to be the world in which the character is moving, which is why the character is in his story, but in fact it is a series of stills all projected together - in some other dimension and not in the finite time such as appears in the image.