Public parks can be messy.
It can be really messy, especially when the weather is good.
It can be chaos with countless secrets. (Of course it has a trash problem too)
On a sunny day, many people come out to the park, and when they leave the park, their secrets remain in the park. Those secrets become thinner and thinner and eventually lose their shape, smell, sound, and privacy, but that takes time.
Personally I avoid going to the park on sunny days because I do not want to contribute to the secret chaos.
The secret chaos effects the environment severely. Humans do not realize it yet, but trees, flowers, air, wind, clouds, and animals are influenced by the secret chaos.