Video from pete beard
The Illustrations of Gustaf Tenggren
"Gustaf Tenggren isn't the one illustrator to have undergone a stylistic transformation, however with most others, the change was to at least one extent or one other evolutionary. In Tenggren's case, the change of path was apparently each instantaneous and everlasting. And in some ways, his complete output spans two distinctively completely different approaches to the creation of fantasy narratives in the course of the twentieth century." from the video introduction
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