An image projection apparatus comprising an image source such as a projector, or a LCD or television display, a frame or fixed mounting points located in a permanent structure, and an at least partially transparent screen: the frame or fixed mounting points being arranged to retain the screen under tension, such that the screen is inclined at an angle with respect to a plane of emission of light from the projector; the screen having a front surface arranged such that light emitted from the projector is reflected therefrom; and the projector being arranged to project an image such that light forming the image impinges upon the screen such that a virtual image is created from light reflected from the screen, the virtual image appearing to be located behind the screen, and wherein the frame or the fixed mounting points comprise(s) first and second retention members (116; 534) arranged to sandwich an edge region of the screen therebetween, characterized in that the screen is a polymeric transparent foil that is held taught and substantially wrinkle-free by the retention members (116; 534), the retention members having generally parallel faces which clamp an edge region of the foil between them, and wherein flexible tensioning means (114; 128) are provided at spaced apart locations around the periphery of the foil to enable the foil to have tensioning force independently varied at the said spaced apart locations around the periphery of the foil, and wherein the first and second retention members (116; 534) are connected to one or more of the flexible tensioning means (114; 532; 538) which extend from the frame or fixed mounting points, the foil, flexible tensioning means and the frame or fixed mounting points lying in a common inclined plane, with the tension on the foil being applied in the plane of the flexible tensioning means (114; 532; 538), and the foil, and optionally or preferably wherein the tensioning means comprise straps and ratchet strap tensioners, or straps and a friction-locking buckle arrangement. the frame or fixed mounting points being arranged to retain the screen under tension, such that the screen is inclined at an angle with respect to a plane of emission of light from the projector; the screen having a front surface arranged such that light emitted from the projector is reflected therefrom; and the projector being arranged to project an image such that light forming the image impinges upon the screen such that a virtual image is created from light reflected from the screen, the virtual image appearing to be located behind the screen, and wherein the frame or the fixed mounting points comprise(s) first and second retention members (116; 534) arranged to sandwich an edge region of the screen therebetween, characterized in that the screen is a polymeric transparent foil that is held taught and substantially wrinkle-free by the retention members (116; 534), the retention members having generally parallel faces which clamp an edge region of the foil between them, and wherein flexible tensioning means (114; 128) are provided at spaced apart locations around the periphery of the foil to enable the foil to have tensioning force independently varied at the said spaced apart locations around the periphery of the foil, and wherein the first and second retention members (116; 534) are connected to one or more of the flexible tensioning means (114; 532; 538) which extend from the frame or fixed mounting points, the foil, flexible tensioning means and the frame or fixed mounting points lying in a common inclined plane, with the tension on the foil being applied in the plane of the flexible tensioning means (114; 532; 538), and the foil, and optionally or preferably wherein the tensioning means comprise straps and ratchet strap tensioners, or straps and a friction-locking buckle arrangement.