Do you remember the Slime Farm? Well, never mind it. We didn't have any luck with it no more.
So, here's how it currently is. We're gonna use it for things that we can't put up there.
This is how it looks.
It's not very effective, but it doesn't really matter at the moment because we're only using it for some dyes to use on the wool to put on the entrance.
See these three pressure plates? Well, they light up the redstone torch at the door, so we don't need to go all the way inside to check for new blocks.
This is the torch:
Basically, cactus can't be placed when there are blocks directly by the side of them. Therefore, it is an auto-harvesting system.
It's pretty easy to be made, but if you guys want a tutorial, tell me. I'll be glad to make it.