The space or context of experience is determined by the limits of what can be freely changed; it is the way that you implicitly find yourself in the midst of things, of matters, but with a sense of possible variations that can be induced by changes in attention. It's why you can identify as will or freedom without actually willing anything or exercising freedom. At the same time this space or context supplies all available targets of attention. This is not in fact the limit of experience but you are completely blind to any possibilities outside of this space as it presently appears even though you know that they exist. It results perhaps from a mental mechanism needed to stabilise experience by maintaining its frame and it gives everydayness its particularly stifling quality. There are more or less violent ways to shatter it, but it is remarkable that failing these it is almost impossible to do so by purely internal means.