Chair obtained by assembling pieces cut out of a plane sheet

A chair obtained out of a square shaped plane sheet (1) by a first symmetrical central cut (2) dividing the two basic component parts (3, 4), each consisting of a horizontal crosspiece (5), a pair of legs (6), and a back support (7), subsequently by a second and a third cut (8, 9) running between the chair legs (6), so as to obtain the seat (10), and the back board (11), finally by two shorter cuts (12, 13), respectively made into the lower center section and the upper center section of the two crosspieces (5) belonging to the basic component parts (3, 4), whereby the chair is obtained by cross intersecting the two shorter cuts (12, 13) of the two crosspieces (5), and by fixing the seat (10), and the back board (11) with suitable joining means (14), respectively on top of the crosspieces (5), and against the back supports (7).