Mostly brought on by a conversation I had with someone about reification and how it then turned into speed and other subjects in science:
Like...is it really that relative though? I know the fruits of science work pretty well but it's kinda hard to wrap my head around how "fuzzy" it might really be.
The problem isn't just that you can't measure it, the problem is that the concept of speed doesn't make any sense in the absence of other things. It's a relative property describing a change in proximity between 2 objects, if there is just one object, there is no speed because there is no change in lateral proximity. Speed is not an absolute property that exists without an observer or reference point.
And if that's a mind fuck, well the same applies to space and time as well. Space and time don't actually exist in an absolute sense but they are purely relative to other things. Space and time only become measurable quantities due to the relative difference to other objects and they are only perceivable through measurements.
Seriously there is no absolute clock ticking at a constant speed and with the same rate for everyone, but each observer has their own clock and what that clock displays depends on your relative location and speed with respect to that observer. So if you move away from a clock at the speed of light than time literally stands still. If something passes you with the speed of light than it will shrink. So that's why we use space time in order to calculate what another observer would see.
The general assumption being that each inertial frame of reference is equivalent to any other inertial frame of reference and that the speed of light is the same in all those reference frames. So there is literally no physical experiment that could tell you if two passing objects move at the same speed or one is resting and the other is moving or vice versa. And you can even test that in a train station where you can't tell whether it's your train that moves or the one next to you
Of course that only relates to movement at continuous speeds, changes in speed (acceleration) would be noticeable and if you see the background you're trained to assume that it's you that is moving rather than the ground below your feet or that you're driving towards a wall and not the other way around. But that's just acquired intuition, there's no physical truth to that.
Of course "wind" is an abstract idea. As said there is no such thing as "wind", it's a us grouping several phenomena into one entity and social constructs aren't meaningfully different, except for maybe that inanimate objects resist those categorizations a lot less than human beings...
Why so fatalistic? Like again all that it means that it's a fallacy is that you can't tell with certainty. Which yeah you can't. Even for seemingly easy tasks such as measuring the length of a stick, you can never tell with certainty. It's actually physically impossible to tell the actual length of a stick. That being said, we're able to tell it up to margins of error as small as sub nanometers. Which given we only see difference up to 0.2mm or something like that, is close enough...
Like...is it really that relative though? I know the fruits of science work pretty well but it's kinda hard to wrap my head around how "fuzzy" it might really be.

