A support-framework (1) supports a surface (2), or supported elements, at a designed variable spacing from a support surface (3), using elongate supports (4) of rod-from or tubular-form that act as ties or struts. Each support (4) is anchored at one of its ends to the supported surface (2) or element and, at the other end, to the support surface (3). The anchoring at each end is via a node N that involves an individual domed-member (5) which is secured to the relevant surface (2, 3) or supported element, and which has a part-spherical surface (6) to which the elongate supports (4) are anchored to extend radially by a coupling (12). The domed-members (5) are metallic or plastics, and may each be hemispherical having an outwardly directed equatorial flange (7) by which they are secured to the relevant surface (2, 3) or supported element.