Another rarely seen Kirby cover from the 1970s: 3-D Man. Ironically there is no actual 3-D artwork in the story.Here is an example of actual 3-D work by Kirby from Captain 3-D (Dec 1953), page 10.
ROBERT STEIBEL
Marvelously bizarre double-splash by Jack from Captain America # 209 pgs. 2 - 3 (May 1977), artwork by Kirby/Royer. Below is a scan of the original artwork.
I remember seeing this as a 9-year-old kid back in the 1970s and just being totally befuddled by it. The image had to have been the weirdest thing by far I'd ever seen in a comic book. Quite frankly, I thought Jack must be crazy or maybe partaking of some consciousness expanding drugs. My brother bought this comic book, and I hated it, but twenty years later I think this is a masterpiece. 
But if you thought Arnim Zola was wacky, check out Doughboy, a gigantic blobular sidekick.
I assume this came out during the 1980s. Amazing that we can still ask the same question today. Hopefully Disney/Marvel will answer this question with some class, and instead of a long, fierce court battle between Jack's children and that multi-billion coroporation, we can put the past behind us and celebrate Jack's legacy.
Thanks to Kenn Thomas for sending in this article.
An unpublished panel of Thor's alter-ego Dr. Don Blake. Stan Lee wrote a message on the side "Sol. Save for inking sample." Luckily this was not used as an inking "test." Jack's Margin notes say: "Blake describes exhilaration of becoming Thor -- The surge of great strength -- and his thought of moving boulder."
Apparently Jack wanted the panel to introduce this flashback sequence in Thor # 158 (Nov. 1968), but Lee decided against it. Pages 7 and 8 below were first published in Journey Into Mystery # 83 (Aug 1962).