There is a four floor high building owned by a company:
The first floor
A small office, where the employees are divided in teams of two.
Each teams does the same work, and help each other for everything.
Each team consists of similar number of people of the similar type who do a similar job.
But often the two teams usually end up facing each other.
They work very hard and are an essential part of the building.
The second floor
The second floor is the only place in the building where there are big open windows for ventillation.
It is dirty but the people need this. Without it, the office would have no ventillation and thus the people would suffocate. It is always open, but then it gets blocked every once in a while. The people clean it THEN.
The third floor
In the third floor, there are AGAIN windows. But these windows are fastened shut. They can't be opened, even if you do anything. Though, the view from here is amazing.
The fourth and the final floor
The fourth floor is the last and the strangest of all the floors. The company grows various types of plants here, mainly grass. Only plants. No animals. They kill animals if they ever see one.
And the strangest thing of all is that this company colours their plant. Literally colours them. Their prefered colour is black, but then every colour gets the chance once in a while. Strange!
No. No hints.
What is this company and what are the floors?
P.S. These floors can be solved independently