"Productions of the industrial arts utilitarian in purpose and character are not subject to copyright registration, even if artistically made or ornamented. "No copyright exists in toys, games, dolls, advertising novelties, instruments or tools of any kind, glassware, embroideries, garments, laces, woven fabrics, or any similar articles. "13. _(h) Reproductions of works of art._--This term refers to such reproductions (engravings, woodcuts, etchings, casts, etc.) as contain in themselves an artistic element distinct from that of the original work of art which has been reproduced. "14. _(i) Drawings or plastic works of a scientific or technical character._--This term includes diagrams or models illustrating scientific or technical works, architects' plans, designs for engineering work, etc. "15. _(j) Photographs._--This term covers all positive prints from photographic negatives, including those from moving picture films (the entire series being counted as a single photograph), but not photogravures, half tones, and other photo-engravings. "16. _(k) Prints and pictorial illustrations._--This term comprises all printed pictures not included in the various other classes enumerated above. "Articles of utilitarian purpose do not become capable of copyright registration because they consist in part of pictures which in themselves are copyrightable, e. g., puzzles, games, rebuses, badges, buttons, buckles, pins, novelties of every description, or similar articles. "Postal cards cannot be copyrighted as such. The pictures thereon may be registered as 'prints or pictorial illustrations' or as 'photographs.' Text matter on a postal card may be of such a character that it may be registered as a 'book.' "Mere ornamental scrolls, combinations of lines and colors, decorative borders, and similar designs, or ornamental letters or forms of type are not included in the designation 'prints and pictorial illustrations.' Trademarks cannot be copyrighted nor registered in the Copyright Office." {Sidenote: The question of exhibition}