Piece of furniture

An erectable chair, comprising four columnar support members each having respective upper and lower end portions, a first pair of said four columnar support members being upright and extending parallel to one another in transversely spaced relationship, a second pair of said four columnar support members being inclined to the horizontal and crossing each other substantially midway between said upper and lower end portions thereof and intermediately said columnar support members of said first pair, each end portion of each of said support member being spaced from each end portion of each other one of said support members;

• means for forming a support surface at least between said upper end portions of said four columnar support members and being connected to said upper end portion of the support member of said first and said second pair respectively;
• and a plurality of tension members connecting the end portions of each of said columnar support members with the respective end portions of at least two other of said support members to maintain all of said support members in a desired position in which said support members of said first pair extending upright and parallel to each other and said support members of said second pair are inclined to the horizontal and cross each other substantially intermediate said support member of said first pair, said tension members being stressed to a tension-transmitting state when a weight rests upon said support surface of the erected chair whereby said columnar support members become fixed in said desired position.