- The Dark Crystal is a 1982 dark fantasy film directed by Jim Henson and Frank Oz. It stars the voices of Stephen Garlick, Lisa Maxwell, Billie Whitelaw, Percy Edwards, and Barry Dennen. The film was produced by ITC Entertainment and The Jim Henson Company and distributed by Universal Pictures. The plot revolves around Jen and Kira, two Gelflings on a quest to restore balance to the world of Thra and overthrow the evil, ruling Skeksis by restoring a powerful broken Crystal.
- Dark fantasy (Wikipedia)
Dark fantasy is a subgenre of fantasy literary, artistic, and cinematic works that incorporates disturbing and frightening themes. The term is ambiguously used to describe stories that combine horror elements with one or other of the standard formulas of fantasy.
- Fantasy (Wikipedia)
Fantasy is a genre of speculative fiction which involves themes of the supernatural, magic, and imaginary worlds and creatures.
- Obtuse triangle (Wikipedia)
An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle’s angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.