Pushed up pistons to ward off zombies, skeletons and creepers.
A similar idea already exists using the mechanism as a trap.
If someone (opponent & player) steps on one of the pressure plates, the respective piston is raised and the way is blocked. To prevent that you can simply jump over it, a series of blocks is placed above it.
If the pusher plates are placed inside the circle it is not possible to get out unless you destroy blocks.
In this case, the push plates are placed outside, it is not possible to get in without destroying blocks.
Since NPC's can't intentionally destroy blocks (creepers only explode in the presence of the player) it's not possible for them to get in, unlike the player.
Of course, the blocks are put back in front of the house. I only removed them to show the mechanism.
Normally, your own house is a little bigger and you need a lot of pistons. The classic fence is much more practical.
And it's really very similar to the other, flipped version.
And how do YOU get back in?
Too elaborate and unattractive.
A fence tuts also, as xxluke already says.
Your example protects a 4sqm house and so already requires 36 pistons....
For gamemode 0 a bit too complicated, a fence is simpler and by the way also nicer...
too ugly because I prefer to build a pair of rails around my house and still have a Loren system ^^
Can also dig a 2 deep hole around your house, but that looks even better xD
"A similar idea already exists using the mechanism as a trap."
~
And this idea is just as bad xD
Totally easy to build this in survival, really!
It's a big one...
BAD, because the monsters just jump on the block.
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