Xray vision from composter+piston

If you push yourself down with a pisten to a crawling position inside a composter you can see through blocks. This video shows perfectly how it functions. When already underground its way easier to see a lot more then shown in the video.

Doesn't work witch cauldrons, or pushing down with trapdoors.

https://www.youtube.com/watch?v=c--HWti0GJw