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3.5.4 Pushed-in elements with a parallel boundary curveFigure 109, Anticlastic mechanical pre-stressed membrane with a pushed-in element with parallel boundariesFigure 110, Zeroclastic mechanical pre-stressed membrane with a pushed-in element with parallel boundariesFigure 111, Monoclastic inflatable with a pushed-in element with parallel boundariesFigure 112, Anticlastic inflatable with a pushed-in element with parallel boundariesIf the boarders of a zeroclastic mechanical pre-stressed membrane and an anticlastic mechanical pre-stressedmembrane are parallel with the element pushed-in, it will form a zeroclastic surface.If the direction of a monoclastic or synclastic inflatable surface is parallel to a monoclastic or zeroclasticelement or straight boundary line the surface will be monoclastic.3.5.5 Pushed in elements with a positive boundary curve against an inflatableFigure 113, Synclastic inflatable membrane with a pushed-in element with a positive boundaryFigure 114, monoclastic inflatable membrane with a pushed-in element with a positive boundaryFigure 115, Anticlastic inflatable membrane with a pushed-in element with a positive boundaryAn inflatable structure will make an anticlastic surface to the boundary of any rigid element pushed-in fromthe outside with a positive boarder curvature, also if the positive boundary-line is parallel to the boundarylineof the membrane.3.5.6 Pushed-in elements with a negative boundary curve against an inflatableFigure 116, Synclastic inflatable membrane with a pushed-in element with a negative boundaryFigure 117, monoclastic inflatable membrane with a pushed-in element with a negative boundaryFigure 118, Anticlastic inflatable membrane with a pushed-in element with a negative boundaryAn inflatable structure will make a synclastic surface when a rigid element with a negatively curvedboundary is pushed in from the outside.49