Abstract: A geometric structural assembly includes a plurality of panels. Each of the plurality of panels may be manipulated. Each of the panels comprises a plurality of sets of hinged sections. The sets of hinged sections corresponding to each of the panels are hingedly coupled together. Thus, each of the panels may be manipulated into a selected two dimensional geometric shape. Each of the plurality of panels is movably coupled together. Thus, the plurality of panels may be manipulated into a selected three dimensional geometric shape.

Abstract: A contaminant removal device (10) is disclosed for removing contaminants from contaminant laden target material when the contaminants are more dense than the target material. The device (10) includes gas ejecting means (18, 20) for ejecting a current of gas in an upwardly and forwardly direction, and means (14) for causing contaminant laden target material to traverse the current of gas during use. The gas ejecting means (18, 20) is arranged such that a substantial proportion of the target material is moved forwardly by the gas ejecting means (18, 20) to be disposed above a first location, and such that a substantial proportion of the contaminants does not move sufficiently forwardly to be disposed above the first location and falls downwardly towards a second location under action of gravity.