Dragende constructies

Bed 1

Bron:
http://www.dailymail.co.uk/sciencetech/article-2141181/There-22-bed-little-said--Is-cardboard-Eco-bed-holds-weight-nearly-dozen-people.html





Bed 2

Bron:
http://design-for-impact.blogspot.be/2011/10/leafbed-is-camp-cardboard-designed-for.html