Doctor strange was another counter culture hero like the Hulk in the 60's he lived in Greenwich Village in the early 60s which was a mecca for music, hippie counter culture, and mind expanding drugs. Ditko's cosmic art was certainly psychedelic lsd trippy inspired as well as just flat out awesome.
From wiki
The stories showcased surrealistic mystical landscapes and increasingly vivid visuals that helped make the feature a favorite of college students. Comics historian Mike Benton wrote,
"The Dr. Strange stories of the 1960s constructed a cohesive cosmology that would have thrilled any self-respecting theosophist. College students, minds freshly opened by psychedelic experiences and Eastern mysticism, read Ditko and Lee's Dr. Strange stories with the belief of a recent Hare Krishna convert. Meaning was everywhere, and readers analyzed the Dr. Strange stories for their relationship to Egyptian myths, Sumerian gods, and Jungian archetypes."[3]
"People who read 'Doctor Strange' thought people at Marvel must be heads [i.e., drug users]," recalled then-associate editor and former Doctor Strange writer Roy Thomas in 1971, "because they had had similar experiences high on mushrooms. But … I don't use hallucinogens, nor do I think any artists do."[4]
"Steve Ditko contributed some of his most surrealistic work to the comic book and gave it a disorienting, hallucinogenic quality. Dr. Strange's adventures take place in bizarre worlds and twisting dimensions that resembled Salvador Dalí paintings. Inspired by the pulp-fiction magicians of Stan Lee's childhood as well as by contemporary Beat culture, Dr. Strange remarkably predicted the youth counterculture's fascination with Eastern mysticism and psychedelia. Never among Marvel's more popular or accessible characters, Dr. Strange still found a niche among an audience seeking a challenging alternative to more conventional superhero fare