I think our senses are valid, that what we perceptually experience via the senses is a ‘true’ representation or picture of the ‘world’ as it is, we see a blue sky because the sky is blue.
By what logical means can you postulate that the world is other than how we apprehend it perceptually?
Optical illusions are usually brought up to buttress the idea that we can not trust our senses. Take the image of stick partially submerged in water, it appears bent but it actually remains straight , proof they say that the senses can’t give us a ‘true’ picture. But what we are seeing is the effect of distortion in the interplay between light and water and even if we don’t know or can’t understand how the phenomenon works, our eyes can’t help but ‘show us the truth’.