There is a 4 ground excessive constructing owned by an organization:

The first ground

A small workplace, the place the staff are divided in groups of two.
Each groups does the identical work, and assist one another for every little thing.
Each staff consists of comparable variety of individuals of the same kind who do the same job.
But usually the 2 groups often find yourself going through one another.
They work very onerous and are an important a part of the constructing.

The second ground

The second ground is the one place within the constructing the place there are large open home windows for ventillation.
It is soiled however the individuals want this. Without it, the workplace would don’t have any ventillation and thus the individuals would suffocate. It is all the time open, however then it will get blocked each now and again. The individuals clear it THEN.

The third ground

In the third ground, there are AGAIN home windows. But these home windows are fixed shut. They cannot be opened, even when you do something. Though, the view from right here is superb.

The fourth and the ultimate ground

The fourth ground is the final and the strangest of all of the flooring. The firm grows varied varieties of vegetation right here, primarily grass. Only vegetation. No animals. They kill animals in the event that they ever see one.
And the strangest factor of all is that this firm colors their plant. Literally colors them. Their prefered color is black, however then each color will get the possibility now and again. Strange!

HINT:

No. No hints.

What is that this firm and what are the flooring?

P.S. These flooring may be solved independently