囚鸟不知海囚鱼不知天
[qiú niăo bù zhī hăi qiú yú bù zhī tiān]
The title translates to: A caged bird doesn't know the sea, an imprisoned fish doesn't know the sky. This signifies someone feels constrained within a limited view of life, and has yet to broaden perspectives. The feeling could be related to longing for freedom or exploration beyond current circumstances.