narrow perspective; limited view
A set phrase from classical Chinese, literally 'the view of a frog in a well', used to describe a narrow or parochial outlook. Rare in modern Japanese; more commonly expressed as 井の中の蛙大海を知らず or similar proverbs.
The phrase 'seia no ken' is a classical idiom that warns against narrow-mindedness.
Derived from classical Chinese literature, likely from the Zhuangzi, where a frog in a well cannot comprehend the vastness of the sea. The Japanese reading is on'yomi, reflecting its Sino-Japanese origin.