Minecraft wiki entry for Piston_uses, associated text: 1 Flush doors
1.1 2×2 Flush door
1.2 1×2 Flush door
1.3 2×2 Flush door for BE
1.4 Videos
2 Extenders
2.1 Many smallest extenders
2.2 Tileable upward 1 wide double extender
2.3 Tileable ceiling double extender
2.4 1 wide double extender (downward)
2.5 1 wide horizontal double piston extender
2.6 Hidden piston stairs
2.6.1 Piston escalator
3 Doors
3.1 Compact 2×3 piston door
3.2 Simple 2×2 piston door
3.3 3×3 piston door
3.4 4×4 piston door
3.5 5x5 piston door
3.6 Simplest 1×2 piston door
3.7 3×3 spiraling iris door
3.8 (1.12+) scalable piston door (up to 15×15)
3.9 Self-resetting sand door
3.10 Piston door tutorial
3.11 Piston lava door
3.12 Flush Seamless piston door
3.13 Improved hidden piston door
3.14 Smallest 3x3 piston door
3.15 1x2 flush seamless door
3.16 Hidden door
3.17 Castle gate
4 Structures
4.1 Piston Draw Bridge
4.2 Piston table
4.3 Scrolling display
4.4 Garbage disposal
4.5 Dry docks
4.6 Variable enchantment room
4.7 Self-repairing structures
4.8 Moving vehicles/machines
5 Traps
5.1 Disappearing floor trap
5.2 Hidden bridges
5.3 Suffocation trap
5.4 Floodgate
6 Storage
6.1 Hidden chest/store room
7 Farming
8 Redstone circuits
9 Light switches
10 Mining
11 Other devices
11.1 Minecart direction shifter
11.2 Locking chests
11.3 Free standing self-refilling anvil system flush with floor
11.4 Modular button speedlock using pistons
11.5 Upgrade system for minigames