君不见 is a classical Chinese rhetorical phrase meaning 'can't you see?' or 'do you not see?' — it opens a poetic or formal statement to draw the listener's attention to a vivid scene or a universal truth. The 君 (jūn) is a respectful 'you', and 不见 (bú jiàn) means 'do not see'. You'll encounter it in classical poetry, historical speeches, and modern formal writing that borrows a literary tone. It always appears at the beginning of a clause, followed by the thing the speaker wants you to notice.