An improvement to a flying disc that returns to the user by means of a string using rotational energy in a manner of a yo-yo. In one embodiment, the device comprises a steam console for producing a curtain of steamfog, an air modulator for providing a varying current of air that modulates the curtain of steam produced by the console, and a lighting assembly that produces a flood of colored light that is projected onto the modulated curtain of steam produced by the console and air modulator. Another embodiment of the process relates to a clonong vector which comprises a plasmid or bacteriophage comprising the phage DNA of the invention. Deformation results from thinning the substrate locally in the region or by providing a linear perforation that extends approximately perpendicular to the plane of the substrate.