What is the fine-grained topic of the following text: Perhaps the most impressive of Hokusai's works to be found in Obuse is the incredible giant picture of a Chinese Phoenix which adorns the ceiling at Gassho-in Temple was completed in the final year of his life: Lie back on the tatami floor and stare upwards to view the entire painting (and also seek out the hidden illustration!). Only return the topic.
Hokusai's Chinese Phoenix painting in Gassho-in Temple, Obuse.