More ideas from Ole
gravitational_water_power.jpg

While trying to find a method for aerating water without energy input, Austrian engineer Franz Zotlöterer stumbled across the idea of a mini-power plant which is simple to construct and has a turbine efficiency of but which is safe for fish due to

old windows in backyard - Google Search

This is a 7 x 12 feet greenhouse made out of old windows, polycarbonate plastic roof panels and cedar shakes. it's tall enough to be a great art studio.