What are the motifs in Kon-Tiki: Across the Pacific by Raft by Thor Heyerdahl?

The power of myth is a recurring idea.The South Americans and Polynesians certainly hope that Thor is right. Their ancient heritage depends on the truth of the Kon Tiki and other mythology that define their people. The power that myth contains exists in people's faith, and to claim myths to be nothing more than creative fiction is to lessen faith and reduce self-esteem. All human cultures either fight hard to retain their cherished myths or hold them quietly in their hearts if another culture's myths dominate.