Think of it this way: a cloud is just water droplets suspended in the air. The air is transparent. Water is transparent. Yet... you can't see through clouds. T

Think of it this way: a cloud is just water droplets suspended in the air. The air is transparent. Water is transparent. Yet... you can't see through clouds. That's essentially what a full Dyson Swarm looks like. People have modeled how many orbitals you'd need to achieve this and I believe that if you orbit them at 1 AU (plus or minus) the mean distance between them is still around 150,000km.