A narrow or restricted perspective; often used as a humble way to refer to one's own opinions.

(idiom) to look at the sky through a bamboo tube and measure the sea with a ladle; used to describe a person with a very restricted perspective or superficial understanding of a matter

To look at the sky through a bamboo tube; used to describe a person with limited experience or a narrow perspective who can only see a small part of the whole situation.

to look at the sky through a tube; a metaphor for having a very restricted or narrow perspective

in my humble opinion; from my limited perspective

narrow-minded; limited in knowledge or experience; literally to look at the sky through a tube or lift things with a small basket