An ALU with the functions XOR, AND, and ADD, which are selectable via the switches. The green Wool represents inputs A and B, the blue Wool represents the Carry input and output, and the red Wool is the resulting output.
This is the Villager Trading Hall featured in a Tango Tek video. Villagers fall into the slots and you can keep the ones with good trades and kill off the ones that you don't want.
This is a medium-sized trading post that I built in our server. The villager breeder will carry them up and over via the water stream and drop them down into the slots. The Hoppers are meant to transport raw chicken and reeds into the trading post to sell to the villagers.