Differences in how they are experienced, either directly by us or via some sort of device that extends what we experience.
This is quite correct. And the reason they are experienced as difference is because they relate to each other as difference.
And any labeling will be in words that are descriptions of those experiences.
Correct-a-mundo.
But we cannot speak about things we cannot experience or we are acting like those who have faith in God.
It has a property. I know it does. I cannot describe it because I cannot experience it.
We can speak quite well about the past, but that is not something we can experience no? It's not the same as faith now is it? More below...
But we used technology to extend our abilities there.
Yes! And as a result we learn about different properties and learn that for humans to exist, those properties must have been present before humans were present to observe them.
I am not saying that properties do not exist except if we perceive them.
The primary assertion of the thread is that properties don't exist except when humans perceive them. That's is solely what I have been disagreeing with.
I am saying that we cannot talk about them.
Theres are a few cases to consider. If a particular property is not known to humans then I agree. The reason is because there is no subject matter to talk about. If a particular property is known then we can talk about it for time periods where we did not directly observe the property. In all cases we can assert that properties exist.
And a property we cannot talk about is meaningless.
Technically, that *unknown* property still has meaning (i.e. it has its relationships in place). But if we have no knowledge of it then there's just no knowledge to talk about.
Before we understood infra red vision it would was impossible to talk about it. We might notice that snakes could do things in 'complete darkness' we could not understand, but we would not have labeled that infra red vision.
Correct. But then again, as you have probably noticed this is not something I was ever disagreeing with. I am disagreeing with the OP.
You are mixing up two things. I am not saying that everything is dependent on our experiencing it. But if we cannot experience it we cannot talk about it. And we cannot know it is there, unless we are talking about faith.
One or both of us are certainly mixing something up. The OP is saying that properties (any kind) don't exist without a person to perceive them. That is solely what I have been disagreeing with.
Regarding specific properties, we certainly cannot describe one that we have never before observed. We can however observe one at point t on a timeline and describe it on any other point t - n or t + n. This is especially important in regards to the OP.
* Humans can observe right now at point t that all objects have properties.
* We can also observe that those properties are necessary for things like planetary formation.
* We can observe that Earth formed before there were humans.
* We therefore know that properties existed before there were humans to observe them at t - n.