天是无人地海事无墙城
[tiān shì wú rén dì hăi shì wú qiáng chéng]
Literal meaning is 'the sky is an empty land, the sea has no walls.' It expresses a feeling of vast openness or boundless freedom, suggesting that there are no limitations or restrictions. The term also can reflect someone’s broad and uninhibited perspective or a desire to escape constraints.