This was a new realization about time structures: because they are built on silence, they can permit anything at all to happen within them. Given a set phrase length, any sound at all could find a home within it; this was just an extension of Cage’s earlier belief in the equality of all sounds. But beyond this, the empty time structure does not require any particular continuity, syntax, ordering, or sense of progress of the sounds within it. A composition structured as lengths of time does not rely upon the sounds themselves to create the structure: it exists with or without them and it is silent about how they should come and go. It is like the ongoing cycle of the moon?new to full to new again?which unfolds in the sky. The activities of people, for the most part, take place independently of it, although still within the grand time structure of this cycle. There is a silence within that lunar cycle within which our lives unfold.