It doesn't matter wrote:This makes sense. We only have knowledge of these things from our own senses and though-processing. But the things-in-themselves, such as vibrations, still exist. We simply do not directly know what they are.
There is a need to put the above in its proper perspective.
1. 'Our own senses' include those that we inherited from our ancestors since 4 billions years ago as programmed in our DNA and genes.
2. Vibrations still exists, but they are qualified to our common senses, verifiable scientific evidence, etc.
They cannot be standalone things-in-themselves.
3. Vibrations-in-themselves or things-in-themselves, thing-in-itself, i.e. without any reference to human beings, can be speculated out of pure reason, but we cannot relate them to the empirical positively in anyway.
For example, solid objects are made of materials, molecules, atoms, sub-atomic particles, and these are verifiable by scientific experiments.
However we cannot go beyond the above empirical and insist,
based solely on pure reason, that objects are made of
some absolute ultimate particle (thing-in-itself).