[UCANSEE2]

If a cell is mostly "empty space" why is it objects appear to be solid?

When a plane throws 'chaff' out into the air as a decoy the radar waves bounces back off it giving the impression of a solid object.

Same thing.

[sirchtruth]

When a plane throws 'chaff' out into the air as a decoy the radar waves bounces back off it giving the impression of a solid object.

That's a great analogy!