Minecraft wiki entry for Clay_farming, associated text: To semi-automate the design, you will have needed to build it in strips. First place dispensers facing into the dirt blocks and place water bottles in each of them, and link them up to a button using redstone. You can also place observers facing into the other side of the dirt blocks and connecting them to a bell or note blocks to make a sound and to a redstone lamp to make a light so that you know when the clay is ready to harvest. To activate the farm, press the button and it will soak the dirt blocks, which will also activate the observers, but when the observers are activated again, the clay is fresh to harvest.