I used to paint with a poem, and later someone painted a monk carrying a load of water to represent temples and rivers. What poem or story is it? thank you

It's a story, that is, the last question of the emperor's court exam is to let people draw temples, but they can't clearly show the appearance of temples. Many talented people splashed ink, some hid cornices behind the mountains, and some painted hidden pagodas in the mountains, but one man painted a monk carrying water in the mountains and finally won the first prize of that year.