The design of the Assumption Cathedral is related to the so-called "Naryshkin architectural style", which emerged at the time of Peter the Great's youth. Back then, the tsar's passion for the West prompted the traditional Russian architecture to embrace new European styles. Previously, this style was known as Naryshkin Baroque (many researchers still use that term). But Baroque architects were primarily concerned with plasticity and forms rather than the building's decorative elements. A cubic cathedral can therefore not be classified as Baroque. St Petersburg's Smolny Cathedral and Moscow's St Clement Church would be more suitable examples of Baroque architecture. The Naryshkin style got its name from the Naryshkins, Peter the Great's maternal relatives who commissioned most of Moscow's churches built in that style. In Europe, this type of architecture is classified as mannerist, but there is no such term in the Russian architectural tradition. So the best thing to do would be to agree with the contemporary researchers and refer to it as the Naryshkin style (rather than Baroque).
The constructors did a great job applying masterful carving techniques, with ornamental plants chosen as the key exterior design theme. One can find here grapes, leaves, flowers and fruits, some of them fairly realistic, while others produced in an entirely abstract manner. One thing is for sure, though: none of the decor elements is quite the same as the others.