Frutiger aero/Aeropolis

They are basically banal:
No littering allowed
Crimes must not be committed under any circumstances
And many other important rules, but the most important rule is never go into black buildings

Here I will list all the entities:

Residents:
These are ordinary people who live in Aeropolis. They work, do their thing, play, and so on. But there's one thing that sets them apart from ordinary people in other cities: they have no faces. Instead, the entire space where a face should be is bathed in a soft white light. Yes, they may look familiar, but you can't see anything other than the light on their faces (and their hair, too). Despite the light, it doesn't help combat the darkness.

Aero:
These are the same entities as the residents, but they are easily distinguished: 1. They have a face. 2. They were born in the Windows XP aesthetic. That is, icons may float around them, and their clothing may resemble this aesthetic. The Aeros themselves are painted in white, blue, and green tones, with occasional hints of pink and yellow. Aeros usually work with the city's ecology, helping to make the place cleaner and more comfortable for other locals.

Animals:
Just animals - goldfish, cats, dogs, birds, hamsters, guinea pigs, rats, and so on.

Shadows...:
They live in black buildings. They look like black human figures. You can't communicate with them at all—they're very aggressive, resilient, and attack everything they see. At least, scientists are studying them. They haven't yet discovered the reason for such intense aggression, as shadows can't speak either. However, they can produce very short phrases in Morse code, like: "Yes," "No," "I don't know," "Kill," "Chaos," and other short phrases.

Glass:
Unlike the shadows, they are friendly and helpful to the city. They look like glass figures of people, but they are indestructible. They also cannot speak, not even in Morse code, unlike the shadows. Scientists are also studying them, but so far they have not detected any aggression.

Sometimes some actions are carried out by sound, for example:
-When you ate something
-When did you fall asleep?
-when day comes
-When night falls
-When your account balance is replenished
-End of lesson, beginning of lesson
-Background calming music in parks, banks, houses.
-Are you taking pills?
And much more. Usually, music is calm, and sounds are ringtones, but calm sounds, sometimes even Windows XP sounds.

Now I'll explain what locations there are in Aeropolis.

"School. Our sweet children and teenagers study here. They're taught not only the usual subjects, but also ecology, like how to care for our goldfish and help make the world a cleaner and kinder place. If you're between 7 and 17, you should go there. It's all white and green with blue hues."

• University. Same as school, but here you choose your major and what you'll major in. There are countless options, so the choice is yours. You can attend if you're between 18 and 24 years old.

• A bank. I don't think I need to explain anything here. It's just a bank. You go there to save money, withdraw money, exchange currencies, and make payments. Banks are usually in shades of white and green.

• Store. There are many different kinds of stores here – grocery, clothing, building materials, toys, jewelry, office supplies, sweets, vegetables, fruits, dairy products. In short, the list of stores is endless.

• The stadium. Well, that's where the local athletes compete and train. You can sit on the green seats and watch them, just don't distract them.

"Black buildings... No one knows where they come from, how they got there, or how to get rid of them. They appear twice a year. Please, for your own safety, don't go there. At the very least, your memory will be erased and you won't remember anything, and at the very most, you'll be erased, after which no one will be able to find, hear, or feel you. They teach about black buildings in school, to children and teenagers, that they should never go there. Even the rules of the Aeropolis world mention black buildings as dangerous places. Yes, the government is trying to combat them, but all attempts have been unavoidable.

Okay, there are actually a lot of locations here - offices, playgrounds, gyms, hospitals, police, fire station, and so on.

There are many locations here. Basically, it's a town located in the center of an endless, green, empty, flowerless grassy field, where the sun shines brightly, but not too brightly. Goldfish and old Windows icons (they're not tangible, so don't even think about touching them) might float across the field. If you walk into the distance, you'll soon see the town again. Now that I've described the field where the town is, let's move on to the town itself.
The city is called Aeropolis. The high-rise buildings here are usually pure white or covered in transparent, yet very strong, glass. The city plays soothing music in the style of Frutiger Aero, and bubbles float around, not to mention goldfish. It's especially beautiful at night. The goldfish can glow a soft orange, and the lanterns around them shine a calming, snow-white, slightly bluish light, creating a sense of security. And it's not false; it's very safe here. Anything that threatens the lives of Aeropolis residents or if someone breaks the rules is instantly erased from their bad past, which they will never remember, and will instead behave like good citizens like everyone else.