Pushing the player into a composter causes an xray vision effect

Standing in a composter and pushing yourself down with a piston causes an xray vision effect for water, lava, and solid blocks. It works for liquids when you are just below their surface, and for any solid blocks that the composter is directly adjacent to.

Steps to recreate:

1. Place a composter surrounded by blocks or liquids, except on the top.
2. Place a lever or other redstone wiring that will power the piston.
3. Jump into the composter.
4. Place a piston above your head.
5. Activate the piston.