The Wizard of Oz is a very symbolic story which some take to be of a predominantly financial nature. It is said that Pink Floyd's "Dark Side of the Moon" album synchronizes with the film wonderfully, however the durations are certainly quite different.
Like most great stories, this one begins with the archetypal "journey to the netherworld," when Dorothy's farmhouse in rural Kansas is taken up by a tornado and somehow lands in "Oz," a strange and magical world inhabited by witches good and bad, flying monkeys and singing dwarves. Interestingly, "Oz" is also a Judaeo-Christian demon related to Azazel etc. (Mathers).
On her journey to meet the Wizard of Oz, who she hopes will send her home, she meets a "cowardly lion," a tin-man without a heart, and a scarecrow without a brain, all of whom also hope to have their wishes granted by Oz. On their way to his emerald castle they pass through an opium-field, where they become intoxicated and almost slip into a perpetual stupor, or 'deep sleep.' They are also captured by the Wicked Witch and her flying monkeys, however she apparently melts when exposed to water, so they were able to escape after killing her.
Oz eventually sends her home, and she wakes up feverish in her bed; it was then that she realized who the lion, tin-man and scarecrow truly were - her relatives.
The dual-personification of Venus is a secondary, mythologically inspired aspect of the film, as the "Good Witch of the East" and "Wicked Witch of the West" appear to allude to Aphrodite-Urania and Aphrodite-Pandemos respectively, who for purposes of understanding may be compared to the biblical Eve and Virgin Mary (see: Venus (Planetary Deity)).