of a structure it will be an end panel but panel 32 will be common to the next cavity and it is commonly known as a partition panel the spiral connectors which connect panels 26 and 28 to panel 32 therefore also simultaneously embrace the next adjacent side panels of the next cavity and so on it will be understood that the structures depicted in fig1 is therefore foldable by relative pivoting between the various panels and fig3 is included to show how the structures can be folded fig3 shows the top structure 16 and the additional panels making up cavity 22 are indicated by reference numerals 26 a 28 a and 32 a to collapse the structure the alternate partition panels 30 and 32 a are moved in opposite directions as indicated by the arrows 34 and 36 and so the whole structure can fold up zigzag or concertina fashion although the partition panels 32 and the end panels 30 are of trapezoidal form there is sufficient clearance within the coil connectors 18 to allow complete folding to take place each of the structures 12 14 and 16 is collapsible in the same way and therefore can be folded up for transportation purposes the structures 12 14 and 16 need not be of trapezoidal form but this form is of particular advantage in relation to the utilisation of the present invention in the present invention the outer surfaces of the panels of the structures shown in fig1 are provided to receive material to form an outer surface to give the overall wall the appearance of having a surface of.