  Sphericons and D-forms are 3D objects created and described by artists, which
have separately received attention in the mathematical literature in the last
15 or so years. The attempt to classify a seamed, crocheted form geometrically
led to the observation, which appears not to have been previously made
explicit, that these objects are related. General results concerning
$(N,k)$-icons and seam-, D- and pita-forms are given. Instructions to crochet
D-forms are given in the Appendix.
