Every time I overlap two pieces of coarse paper on table and start writing. Some ink marks will penetrate into the underlying paper. Reading these imprints is reviewing every training in details for me.
Many beginners who study Chinese seal calligraphy spend a lot of time and effort practicing basic skills - being trained to keep focusing on the balance between power in their bodies and movements of the brush pens, writing the elementary shapes ( line, strip, arc, circle) repeatedly on paper, hiding the sharp point of the brush from beginning to the end. This meditative practice can be show on the upper paper and the changes of power remain on the underlying one.