Abstract: An apparatus and method for attenuating light transmitted through a surface. The apparatus may include a light attenuator comprised of a substrate and an electrostatic layer. The electrostatic layer may be configured to electrostatically couple with the surface. The electrostatic layer may also electrostatically couple with the substrate. The substrate, the electrostatic layer or layers, or a light attenuating substance combined with at least one of the substrate and the electrostatic layer may attenuate light transmitted through the surface. The method may include positioning the light attenuator on the surface between the light source and the light receiver.

Abstract: A walker for use by infants in learning to walk includes a pair of spaced apart closed ring structures that are supported apart by a plurality of inwardly inclined adjustable struts. The rings are of a variable diameter with the lower ring defining a base substantially larger than the upper ring. The upper ring is sized to substantially fit the torso of the infant so as to confine the infant and prevent the infant from falling. The lower, larger ring provides an enlarged base which prevents the apparatus from tipping during use. The infant grips the upper ring during use. The adjustable struts allow adjustment between the upper and lower rings so that the device can be sized to fit each user of different height.