The role of the sea in culture has been important for centuries, as people experience the sea in contradictory ways: as powerful but serene, beautiful but dangerous. Human responses to the sea can be found in artforms including literature, art, poetry, film, theatre, and classical music. The earliest art representing boats is 40,000 years old. Since then, artists in different countries and cultures have depicted the sea. Symbolically, the sea has been perceived as a hostile environment populated by fantastic creatures: the Leviathan of the Bible, Isonade in Japanese mythology, and the kraken of late Norse mythology. In the works of the psychiatrist Carl Jung, the sea symbolises the personal and the collective unconscious in dream interpretation.