Abstract: A supporting assembly includes a base member having a spherical depression and a supporting platform having a hemispherical projection. The projection is mounted in the depression and a pillar projects through the two members, the pillar being rotatable in the base member and extending through a slot in the hemispherical projection. The top of the pillar is square in section and co-operates with a channel of similar width formed in the hemispherical projection having the same axis as the slot. The arrangement permits a VDU to pivot in one plane only relative to the pillar (so that the edge of the screen remains parallel to a desk top) and to swivel on the base member.