Other critics claimed that only Mi Fu could imitate the style of the great calligraphists of the Six Dynasties. Mi Fu indeed seems to have been an excellent imitator; some of these imitations were so good that they were taken for the originals. Mi Fu's son also testified that his father always kept some calligraphic masterpiece of the Tang or the Qin period in his desk as a model. At night he would place it in a box at the side of his pillow.