Very pretty. But the only answer to 'Why?' is 'Because'.

You can explain 'how' the dominoes fall -the phsysical/ mechanical forces that act on them to make them fall. Most answers to 'why' are answered by 'how'.

'Why' in the sense of reasons, rather than causes, is a human question. It's applicable only to human actions and interactions. Our peculiarity of consciousness makes or allows us to come up with reasons for things.

The Universe, however, is not human. Therefore it makes no sense to look for or expect a human reason for what it does or is. We do not know if the Universe is conscious, but if it is, it will be at a level or type of consciousness wildly different from ours. Thus any 'why' it mght have will be beyond our comprehension.

So if you want a reason, you'll have to get one for yourself.