The Garden Igloo Kit. in a few different versions. could be a greenhouse +/or alternative to tent accommodations to house a few more summer retreatants. not particularly cost effective though, in my humble view.
This 'new-generation outdoor tent' is a nature-interactive and energy-independent tent with two main parts: the Solar-Air Tube system that generates electricity, and creates airflow throughout the tent; and the Sound Drum which captures sounds to interact
Mobile home. On the road, it measures m by m, and once it has arrived at its destination its floorspace can be increased threefold in a matter of seconds. "De Markies" was awarded the Public Prize at the Rotterdam Design Prize