A retroreflective device securable to a highway by bonding thereto preferably with a viscous strip applied to the highway prior to solidifying cure of the strip includes a generally globular glass central member, a desirably pigmented adhesive layer over the central member and a plurality of peripheral globular glass members connected to the central member by the pigmented adhesive layer. The copolymer is made up of one or more first, second and third monomers, wherein the first monomer possesses an epoxy group and third monomer has a bulky side chain. The invention also includes a fingernail protection portion held in place by the sleeve. A method for identifying an ATX-modulatory compound is additionally provided. A disclosed method includes receiving collimated light with a conventional illumination pattern centered on an optical axis, symmetrically reflecting the collimated light in multiple directions away from the optical axis and reflecting the reflected light to create output light having an off-axis illumination pattern symmetrical about the optical axis. The input apertures are larger than the output apertures thereby reducing the amount of dead space between active areas of light modulating elements seen be a viewer.