vision: light makes contact with different cells in the eye which are sensitive to different frequencies within the visual light spectrum
hearing: the ear detects the vibrations of the air
smell: this one's just magic
I made this post years ago to express my own confusion regarding how smell works and I have since then learned that actually nobody knows how smell works. like the general mechanism is understood, there's a bunch of receptors in the nose that detect different chemicals, but unlike the other special senses there is no model for predicting which things will produce the same or similar sensory experiences. nobody knows how to tell how similar two arbitrary chemicals will smell without just smelling both of them. so yeah I guess it is just magic



















