The tutorial on the hidden jungle tree door I showcased a while ago, but now even more compact. The dimensions are 6*7*8 which is almost half the size of the one I showed you :) Opening and closing goes a little smoother as well.

Resources:
- 11 sticky pistons
- 29 redstone dust
- 24 redstone torches
- 25 redstone repeaters
- 1 half slab
- 81+ building blocks