Fig. 1

On the left, Crane, eighteenth century, by Mitsusuke (1675–1710), National Museum in Kraków. The author died in 1710, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author’s life plus 100 years or fewer. Top right, Crane dance of the Ainu women, northern Hokkaidō, Japan. Photographer Arnold Genthe, 1869–1942, created/published 1908, Digital Id, agc a05214 https://hdl.loc.gov/loc.pnp/agc.7a05214. No known restrictions on publication. Bottom right, Cranes folded in origami paper. Artist Laitche, created: 18 December 2007. This work has been released into the public domain by its author, Laitche. This applies worldwide. In some countries, this may not be legally possible; if so, Laitche grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law