Abstract: The disclosure herein describes an element so constructed as to inter-connect with a similarly constructed element in the making of a mosaic display panel, the element defining a rectangular body, the outer wall of which is provided with a longitudinal projecting guide and a longitudinal channel transversely spaced from one another; the channel has a cross-section so dimensioned as to include therein the cross-section of the guide whereby the guide and channel of an adjacently disposed similarly constructed element may interfit in the channel and guide, respectively, of the first element; each channel includes, at one end thereof, an entry pocket to funnel initial engagement of the guide of two adjacent elements to be engaged to one another in a sliding motion.

Abstract: The disclosure herein describes an element which is adapted for connection to other components of a diagram board, such as a mosaic display panel, which element displays a pair of legs depending from one sidewall thereof; the outer face of one leg is concave while the outer face of the other leg is convex; the legs are made of elastic material so that they are flexible in a first direction which is in a plane perpendicular to the sidewall and in a second direction which is in a longitudinal plane that includes the pair of legs to enable engagement with another component of the assembly.