Things you learn whilst looking at skylights
I can't speak for anyone else, but it hurts my eyes when I look at something intensely lit, which is to say not exactly bright or shining like the sun, although that certainly applies, but also like walking outside on a sunny, snowy day. All the intense white after spending all day indoors under fluorescents gives my eyes the same feeling as when I'm focusing on something very tiny for a long time. That sensation where you physically feel your pupils contracting to deal with the light.
It occurred to me that it would be super-cool if we could have more control over that. For instance, what if we could totally contract our pupils to the point where we could stare into the sun or a spotlight. What if we could expand our pupils for low-light scenarios? It's like one of those biological frills that didn't come in the human model, and can only be had when you procure a cat or a lemur.
Following this train of thought to its necessary terminus, which for me at least involves superheroes or sci-fi, I think a character with very subtle biological perks would be neat. Like the pupils, or having a more finely tuned inner ear, so he or she can always land head-over-heels, which is to say, your feet are touching the ground and you are very much
not supporting your body weight on the pavement with your face.
I think that would be really neat, but then again, I'm a little odd.