There is no such thing as invisibility and - you can't prove me wrong!

What about the absence of matter? There would be nothing there to not be invisible! ^_^

 

what? he asked me to try to prove him wrong.

 

I think blackcat666 did somehow prove him wrong.

 

Maybe everything is invisible until its in your line of site?

 

Wind does not reflect light. I'm with Therese Aline; to state an object is invisible does not negate the objects existence. To take that idea a little further, in so much as suggesting the object, wind, is invisible you must assume the existential presence of the object regardless of your ability to visually perceive it. The key word here, wind IS.

 

Radio waves, all kinds of electronic signals, actually bees can see them apparently, we can't. All around us there'd be red (I imagine they're red for some reason) high frequency waves flying above our heads everywhere we go. The city would be full of it, probably couldn't see the sky through it all if they were physically visible.