In L. Frank Baum's original book "The Wonderful Wizard of Oz," Dorothy's journey to the Land of Oz is not portrayed as a dream. She is indeed transported to Oz by a cyclone that carries her house from Kansas to the magical land.
The story begins with Dorothy and her dog, Toto, living on a farm in Kansas. A cyclone strikes the area, and Dorothy and her house are lifted into the air by its force. After the cyclone settles, Dorothy finds herself in the Land of Oz, a fantastical realm with colorful landscapes and peculiar inhabitants. Throughout the rest of the book, Dorothy embarks on her quest to meet the Wizard of Oz and find a way back home to Kansas.
However, in the famous 1939 film adaptation, "The Wizard of Oz," directed by Victor Fleming, the story takes a different approach. In the movie, Dorothy's adventure in Oz is presented as a dream. After getting hit on the head during the tornado, she experiences a vivid dream in which she meets various characters, including the Scarecrow, Tin Man, and Cowardly Lion.
The decision to present Dorothy's adventure as a dream in the movie was a creative choice made for cinematic purposes. It adds a layer of ambiguity and provides a contrasting perspective compared to the original book. However, in Baum's original novel, there is no suggestion that the events in Oz were merely a dream; they are presented as real experiences in a magical land.