From a big perspective, He Jieshu also belongs to Yan School, and learning Yan can "get its meaning". In terms of pen use, I read more about Fang Bi in my early years, and switched to seal calligraphy in my later years, hiding more front and round pens. His writing is horizontal and vertical, broad and broad, but without broad spirit. This is because he combines the steep brushwork characteristics of Bei Bei and Ouyang Fu Zi, which are very rich in connotation.
Official script "Army Monument Volume"
Official script "Army Monument Volume"