Jiangsu Spring Festival Evening Joke

It's You at the Same Table by Shi and Sun Chen, which is about the changes of primary school students. There is this line when talking about a classmate named Xiaoshi.

Shi: Dear leaders, my childhood dream was to be Qi Baishi. When I grew up, I became a cleaner. Some people say that ideals are far from reality. I said, no, Qi Baishi is just like a cleaner. Thank you.

Sun Chen: Why is he the same?

Shi: When I was young, my ideal was to draw a beautiful tomorrow on the canvas with a small brush.

Sun Chen: Ah.

Shi: Today, I drew a beautiful day on the big canvas of the city with a big brush, so I said Qi Baishi is the same as a cleaner! Thank you, my speech is over.