Clebsch diagonal cubic with 27 lines (museum size)

This is THE math object classic from the late 19th century.
Alfred Clebsch described it in 1871. He was also the first to present a plaster model of it (created by a student of his) in 1872.
Since then, this model made it into numerous collections of mathematical models in museums, universities, etc.
This museum size version is only available in white.
Available sizes: medium (250mm), large (286mm), extra large (313mm).
Smaller sizes are also available in other colors / materials.
For these and more information, see: http://math-sculpture.com/?s=clebsch