Borrowed Views in the Water Garden
It doesn't matter how you expand your point of view in the garden, it is a useful thing to think about when you're designing.
In this case, the reflective pond in front of the tower (a rather famous but private garden in Quebec, Canada) gives us two views.
The trick then is to do this in your own garden AND decide how you're going to enjoy this viewpoint. In other words, there's little point in creating a great view if you don't have a plan to sit and enjoy it - or a walkway that forces you to see it.
Create the view - whether it is an architectural water feature such as this or a special plant or ?? But then figure out how to enjoy it as well.
That's as deep as I can make it on this approach to a big holiday weekend. ;-)