Hydroponic

This system can be stacked infinitely tall. Let's say that you want your system to be 3 layers tall. Then you will need 1 Holder, 3 Sections, 3 Tubes, and 18 Planters. To assemble, just insert the each tube into the hole in the bottom of each section, with the longer side sticking from the bottom of the section. Glue it so that it is watertight. Then, twist the Holder onto a Section, and twist the other sections on top. To water, you can just pour a much water as you want in the top section, and the tubes will just guide the water down into the next section when the water in the top section reaches a certain amount (the water overflows into the tube).