What else am I missing?

I once read a sentence in a novel that went something like this: ‘He devoured her with a look.’ Beyond the basic digestive philosophy of it: that ‘to know is to eat,’ I struggled to actually imagine what this type of gaze would look like on a person. The closest I can get to imagining this gaze is to imagine a look of hunger, but that’s just the image suggesting itself, and besides, what does hunger look like anyway? Yet I know it’s a real look: it’s a leer. It’s a violent gaze.

Whenever I struggle to run a very basic visualising experiment in my head (i.e. What does a grin look like? What does a leer look like? What does a glare look like?) and I inevitably fail, I often find myself thinking, What if there are other seemingly fathomable things that are actually unfathomable to me?

What else am I missing?