The problems of the world are so simple, if approached from a certain angle... Earth element of alchemy, this mobile greenhouse has city and rural applications. The design uses repurposed materials and allows plants to survive in temperatures slightly too cold for them, or seedling starts in the early Spring. The catering trays, in the Bay area, are everywhere. I hope you can try it out at home. Measurements are 8" by 8" by 24", let me know what works! http://artandmaterial.wordpress.com/