Theres a form of poetry called 反诗 that’s basically covertly hiding meaning into poems that criticizes the authorities. In ancient times, scholers would write these poems.

You could also like hide meaning by reading it like acrostically or like diagonally.

Here: (A very amateur freeverse “poem”

天下如此广佛 (The world such vast)
平安京城广场 (Peaceful Beijing Plaza/Square)
达到门下停歇 (People Resting [in Tianamen Square])
兴旺的大都市 (Prosperous Big Capital City)
满路的游徒看 (The roads filled with tourists sightseeing)
这风吹满地沙 (This wind blowing the sands all over the place)

Read diagonally (the highlighted characters)

You get:

天安门大徒沙 (Tian An Men Da Tu Sha)

Which in Mandarin sounds exactly like

天安门大屠杀 (Tiananmen Massacre)

Voila! Thanks for coming to my TED Talk on “How to hide meaning in poetry” Lesson 101, by a random Chinese-American Nerd (me).