Mark Ryden returns with an incredible gallery of creatures   From his Snow Yak to his very personal interpretation of the California bear, for more than 20 years Mark Ryden has populated an incredible “pop surrealist” bestiary of half-animal, half-plush creatures. Freely inspired by the Rushton toys that enjoyed their heyday in America in the ’60s and ’70s, these creatures are now the object of a cult worship among fans of the artist, and are one of his marks of distinction i