Our eco-column will look some thing like this. We will use 2 litre coke bottles to make each section and and they will be holes between them so that the system can breath. To stabilize the structure we will put wooden rods around the diameter of the cylinder connected to a base so that it can stand freely. The fly ranch and insect eating bog in our eco-column will be combined to hold compost, rotting fruit and fruit flies. Also we will not have a spider den but we will have radish plants growing in the terra zone.