Tower of Babel

Pieter Bruegel the Elder, The Tower of Babel, 1563

The story of the Tower of Babel should be understood as a story about the foolishness of attempting to achieve metaphysical elevation by physical means. 

Transhumanism is another Tower of Babel. Technology cannot grant transcendence.

Becoming superhuman, becoming shaman, demands an arduous demolition of the ego and its fixations. To become spirit, the prospective shaman must first experience death. Only then can he visit the heavens and the underworld. Cyborgs cannot do this.

Rainbow Bridge

 

Fra Angelico, The Annunciation, c. 1438-47, photo: Steven Zucker

It is always by way of the rainbow that mythical heroes reach the sky.

Though indirectly, these myths refer to a time when communication between heaven and earth was possible; in consequence of a certain event or a ritual fault, the communication was broken off; but heroes and medicine men are nevertheless able to reestablish it. This myth of a paradisal period brutally abolished by the "fall" of man will engage our attention more than once . . . 

Shamans and magicians ... simply restore—temporarily and for themselves alone—this "bridge" between sky and earth, which was once accessible to all mortals.

The myth of the rainbow as road of the gods and bridge between sky and earth is also found in Japanese tradition, and doubtless existed in the religious conceptions of Mesopotamia. Further, the seven colors of the rainbow have been assimilated to the seven heavens, a symbolism found not only in India and Mesopotamia but also in Judaism. In the Bamiyan frescoes the Buddha is represented seated on a rainbow of seven bands; that is, he transcends the cosmos, just as in the myth of his Nativity he transcends the seven heavens by taking seven strides toward the north and reaching the Center of the World, the culminating peak of the universe. The throne of the Supreme Being is surrounded by a rainbow, and the same symbolism persists into the Christian art of the Renaissance. The Babylonian ziggurat was sometimes represented with seven colors, symbolizing the seven celestial regions; he who climbed its storeys attained the summit of the cosmic world. Similar ideas are found in India and . . . in Australian mythology. The Supreme God of the Kamilaroi, the Wiradjuri, and the Euahlayi dwells in the upper sky, seated on a crystal throne; Bundjil, the Supreme God of the Kulin, remains above the clouds. Mythical heroes and medicine men ascend to these celestial beings by using, among other things, the rainbow.

It will be remembered that the ribbons employed in Buryat initiations are called "rainbows"; in general, they symbolize the shaman's journey to the sky. Shamanic drums are decorated with drawings of the rainbow represented as a bridge to the sky. Indeed, in the Turkic languages the word for rainbow also means bridge. Among the Yurak-Samoyed the shamanic drum is called "bow"; the shaman's magic projects him to the sky like an arrow. Furthermore, there are reasons to believe that the Turks and the Uigur regarded the drum as a "celestial bridge" (rainbow) over which the shaman made his ascent. 

—Mircea Eliade, Shamanism

The First Shaman

Certain legends explain the present decadence of shamans by the pride of the "first shaman," who is believed to have entered into competition with God. According to the Buryat version, the first shaman, Khara-Gyrgän, having declared that his power was boundless, God put him to the test. God took a girl's soul and shut it up in a bottle. To make sure that it would not escape, God put his finger into the neck of the bottle. The shaman flew through the sky, sitting on his drum, discovered the girl's soul and to set it free, changed into a spider and stung God in the face. God instantly pulled out his finger and the girl's soul escaped. Furious, God curtailed Khara-Gyrgän's power, and after that the magical abilities of shamans markedly diminished.

— Mircea Eliade, Shamanism

I notice there is a huge interest in associating shamanism with psychedelics.