man enters the alien portal or tunnel. science fiction . generative ai. for cover, card, postcard,

generative concept man back silhouette green black tunnel teleport portal unknown futuristic future unreal fantasy fantastic fancy surreal dreamlike alien hole abstract abyss adventure alone cave cavity corridor cover dangerous design entrance enter gate figure extraterrestrial horror stranger mystery lonely art artwork dreamy imagination magic mystic scenery illustration enters science fiction for card postcard interior decor packaging print tunnel illustration ai print