Vertical farming. Sphere or cubes as a grow platform?
Surface areas If suspended.
Sphere: 3 foot radius
Cube: (google.com) both.
Sphere is 6ft wide (assuming). Even if two full cubes available 108ft^2-(18ft^2 touching sides) vs. ~113.1ft-one to x points of contact so one sphere holds more food.
Per the plant life:
It depends on the layers of edibles vs the layers of life needing chaff and unneeded removeable waste.
Instead of using pvc you use water proof wire mesh, with rings of smaller holes for the chaff like a cigar cutter that rotated to remove the chaff routinely, large enough to accommodate a growth layer, and liveable layers. You grow the foods straight outward to get the most growth—lit 360 degrees and misted either from within or out so that the water may drain away from the bottom (or put a drip wire down through the core so water cascades down it if extraneous to cycle through cleanly again), with the liveable layers flowering around it to their smallest radius. Then again, at harvest, you repeat the cutting motion and are left with pre trimmed food that takes up very little space but offers up a lot of food if the right types. You have it in sections of at least two to get to the nurbed root system. You have weighted/sized netting to separate the liveable layer from the food—the food should fall through the catchall of the livable layer.
You grow the layering to be stouter, with more of the upper two layers. Smaller to no waste layer. There are perfect ratios to be attained (not done here) to cost per unit fed to volume of product produced.
You sharpen or replace the blades periodically within the housings. Use the blade I designed as they may not break for years being so sharp.
You could also put the canister of water on it. True. (Or just a gravity feed above it with a rotating core in the center of each sphere so roots may not grow into the system that rotates randomly but feeds continuously). You hang multiple spheres in their 75% volume in a box containment value Then fill in the remaining space with smaller spheres likely with different food types if you wanted diversity or all the same for bulk–up until you reach the maximum allotment. The thing about misting is that it uses less water, makes the sphere smaller so the food can be larger. The lights just have to be sealed l.e.d.s.and the right quick grow type. The water nutrient dense.
Anyway it’s just a thought.