Here are some design notes when it comes to modern pergola designs. The most common pergola design is to have decorative and somewhat rounded ends on the beam. The easiest way of creating a more modern pergola is to do away with the decorative ends.
Also, VERY intersting arrangement of the 3 rocks in the center. More equivalently spaced than normal, and unless youre supposed to look at it from the bottom L, also an unusual structure - 3 rocks with 1 tall narrow