In 1829, when the celebrated Japanese artist Katsushika Hokusai was almost 70 years old, he created more than 100 drawings of a dazzling array of subjects: playful cats, serene landscapes, even severed heads. Hokusai’s fame continued to grow after his death in 1849, and the suite of small, elaborate drawings was last purchased a century later, at a Paris auction in 1948. Then it disappeared from the public eye. Now, a total of 103 drawings have resurfaced. According to Antiques Trade Gazette, the Paris auction house Piasa sold them in…