through the green glass doors there is a law , where can i find the law ?

Question

There is A world behind the green glass DOORS
In this world there is only one law. The law of existence & non existence ,

Through the green glass doors there is beatles no bug

Through the green glass doors there is balls but no toys

Through the green glass doors there is puppies but no dogs

Through the green glass doors there is glass no window

Through the green glass doors there is teeth no mouth

Through the green glass doors there is pillows no bed

Through the green glass doors there is doors no portals

Through the green glass doors there is dennis no edward

Through the green glass doors bootles no cup
Find the law ?

Answer 1

This is a kids game. Books, but not magazines, kittens, not cats, apples not oranges.

Words with double letters only, Like glaSS grEEn dOOr.

P.S. It might be easier for others to solve if you spelled "Beetles" (the bug) correctly, not like the group.

Answer 2

In the Building

Answer 3

down the stairs to the right over the desk under the vent and there it is

Answer 4

This is what you said

The law of existence & non existence ,

Answer 5

is it a recycling law?