The common pyramid is a cone-shaped art form. The tree has a short trunk with branches over the entire trunk extension. Branches are guided at an angle at the base and continue to grow more vertically.
Most fruit trees can be grown as a pyramid shape (and its variants). In particular pears ; can give many fruits as a pyramid.
The common pyramid is moderately productive and bears small fruits because of too dense growth habit (shading). Easy to grow espalier. Attack the tree.