Not divided into upper and lower structures. Calligraphy pays attention to inheriting the ancient method, that is, many words in calligraphy are still written in the way used by the ancients, which is very common in calligraphy and is also a manifestation of inheriting the ancient method. Therefore, the peak mountain can be written on the left or in calligraphy. Words of the same type, such as the group words of Preface to Lanting, are also put on it. In addition, like the autumn character in autumn, there is a writing method on the left to put the fire character on the left and the other character on the right. And in the word goose, my word is on the right, on the floor, and there is such a way of writing. Of course, these words are a way for the ancients to deal with words. We cann't make it up now If you write calligraphy, you should still write it according to the ancient method. If we make up words at random, we will only be considered ignorant by others!
Personal opinion, I hope I can help you.