The next picture shows an overhead angled view of a fish model that will be used for the next part of the demonstration.
This picture shows a profile view of the fish model with a red box superimposed on it.
The head of the fish is cut off at the location marked by the red box.
Then the head of the fish is placed on the ground,
and the camera is moved to an overhead view looking down on the fish head.
A fish has a curved shaped as highlighted by the red outlines,
because it is a living creature. But if some tangent lines to the highest point of the curved top,
bottom,
right side,
and left side,
are drawn in, the lines form a rectangle.
This picture shows a profile view of the fish head.
The fish also has a curved shape from this viewpoint.
But if some straight lines that mostly follows the boundaries of the top and bottom of the fish are drawn in the picture,
then extended upwards until they intersect each other,
the lines will meet to form the shape of a triangle.
This picture shows an overhead angled view of the fish head.
The outlines of the rectangle formed by the base of the fish head are drawn in first.
Then the triangular shape formed by each side of the fish head is filled in.
The result is a pyramidal shape.
This picture compares an actual pyramid to the fish head.
The rectangular outline of the bottom of the pyramid and the fish head are highlighted first.
Then the triangular sides of the pyramid and the fish head are highlighted.
According to Happeh theory, the previous demonstration justifies the claim, that the head of a fish can be treated as if it has a pyramidal shape.