Nanoparticles are invisible to to the naked eye but can be seen with magnifying instruments, it's only the limitation of the human eye that makes them invisible. Even the tiniest nanoparticle scatters light but perhaps only a 'nanoeye' would have a fine enough mechanism to see it! Many creatures can see things humans can't as our eyes (and how we process our visual input) are limited in many ways – seeing is a very subjective term. Each piece of knowledge we acquire changes our (visual or other) perception of everything, the more we know, the more we see differently. New devices of nanotechnology such as scanning probe microscopes enable new visions of a hitherto unseen world.
“Come on Grandpa, please let me play with the Vision-O-Matic!” Old Grandpa Edward was never that keen, to get out his crazy Vision-O-Matic machine. He knew that for all the good that it did explaining perception to kid after kid, that one day the spell would be broken in two by some new technology (perhaps invented by you?). But seeing as the incredible object still functioned, and the children still loved it and asked for it often, he disappeared upstairs and bought it down from the dust, this ancient machine that helped dispel some arrogant trust, that the world all around us was just what we see.
Tess sat in the chair, goggles strapped on, her headphones in place, the box on her lap. This magical gadget, the first of its kind, will change her outlook and help her to find, that the world all around us isn't just what we think, that the sky isn't endless and a pig isn't pink. She switched on the V.O.M. and started to see, a land of difference that is beyond you and me. Through the goggles she witnessed a tree made of water and a sky with a lid. Her little kid sister was no longer a kid, but a cloud of tiny objects, gently linked by some threads. Time had gone haywire, it meant very little, sometimes so slow she could see the improbable, and then so fast that literally nothing was visible. She experienced the world with eyes anew – the assumption of being, of staying in one form – everything she'd learnt, all of that had gone! No longer an issue what colour the skin, or how big the plane we were travelling in, because all of the things that make up our world were tossed and turned in a gigantic whirl! Such chaos, such mixed up delight, her eyes had not seen such an amazing sight...
“That's enough now Tess,” her grandfather said, “you know that little and often is how it works best, a hint at what's coming, no more and no less.”