© Esther M. Arkin, Alon Efrat, Christian Knauer, Joseph S. B. Mitchell, Valentin Polishchuk, Günter Rote, Lena Schlipf, Topi Talvitie; licensed under Creative Commons License CC-BY.
Except where otherwise noted, this item's license is described as © Esther M. Arkin, Alon Efrat, Christian Knauer, Joseph S. B. Mitchell, Valentin Polishchuk, Günter Rote, Lena Schlipf, Topi Talvitie; licensed under Creative Commons License CC-BY.