It tells him where to look at first and where he can go.
As mentioned before, the focal point is an anchor for the viewer’s mind. It tells him where to look at first and where he can go. Every aquascape should have a focal point. In the case of smaller tanks, there should be only one focal point and several secondary points of interest. When it comes to larger aquariums, you must create more than one focal point, with one being the main point of focus focal point. Too many points to focus on could lead to a lack of interest for the viewer. Keeping it simple is the best option. The Nature, Iwagumi, or Jungle styles start by creating focal points and implementing the golden ratio rule.