If you have a block under you such as sand or gravel since it can fall through you, you can then pish a piston through your head and you can kind of see through the world. Not major.

To reproduce,
1) Surround yourself with blocks (Any)
2) place a piece of sand above you.
3) Place one piston (Any) in front of you.
4) Place a redstone torch next to it to activate it.