There was an excellent book, around the same time as Eliot Coleman's great book "Four Season Harvest" named "Solar Gardening" by Lea Poisson (if memory serves). In it was described how to make Solar Pods (4x8 raised cold frames that looked like tanning beds) and Solar Cones. Has anyone tried these? I am especially interested in Solar Cones. I'd love to hear from anyone that has experienced either one and the results. From what I recall and have found some scant items on the internet, the cone was made from thin plexiglass or something like it and had a hole in the top, like a funnel pointed to the sky. One site said it was 3 feet in diameter at the bottom and 3 feet high. Any clues or extra reading surely would be appreciated. Thank you.