P.S.

In response to your statement "and things can exist without taking space (for instance: light)."

Light is not a thing. It is a wave within the electro magnetic spectrum. To say light is a thing would be like saying heat is a thing as heat is infrared light. Rather it is a state of being. Waves exist in a medium and the medium is the thing or things.

Waves also take up space. They are measurable. We can measure the difference between blue and red. We measure the frequency of waves in a medium. To say light (waves) are a thing is ridiculous. Even more ridiculous is to say we can not measure light (waves).

Please consider what I have said with an open mind. I look forward to your response.