<P> Fifty animators worked on the scene in which the castle is built, and one frame required 30 hours to render . They later extended similar techniques to Elsa's clothing . While the traditional Norwegian rosemaling was the inspiration for her costuming early in the film, her ice gown was designed similarly to her palace, with snowflakes heavily influencing the style . Her cape itself is a large snowflake . </P> <P> Elsa, princess of Arendelle and heiress to the throne, is born with the ability to create and control ice and snow . As a child, she uses her abilities to create a winter wonderland to play in with her younger sister and best friend, Princess Anna . One night, Elsa accidentally harms Anna with her powers . The king and queen of Arendelle hurriedly take Anna to a tribe of mountain trolls to be healed . While healing Anna, the trolls inform the royals present that Elsa's abilities will grow, becoming both beautiful and very dangerous so she must learn to control them . While the trolls erase Anna's memory of the incident and of her elder sister's powers in general, Elsa is traumatized by the event . The king and queen take steps to control and hide Elsa's ice powers: the castle gates are locked, Elsa is shut away in her bedroom for most of the time, she is given gloves to help suppress her powers and is told to hold in her emotions as well . Nonetheless her powers continue to grow even stronger and so she becomes fearful of harming those she cares about most . Meanwhile, her sister Anna is less happy and confused by the loss of contact with her elder sister and tries, without success, to coax her out of her room . When the sisters grow into teenagers, the ship in which the king and queen are sailing is capsized in a storm and they drown, leaving Anna and Elsa feeling even more lonely . </P> <P> Three years pass, and Elsa, now of age, is set to formally succeed her father as the monarch of Arendelle . Though she is afraid of opening the castle to the large crowds, her coronation goes on relatively peacefully . However, at the reception party, Anna asks for Elsa's blessing to marry Prince Hans of the Southern Isles, whom Anna had met earlier that day . Elsa refuses to bless Hans's offer to marry Anna; he is someone she barely knows, prompting an argument between the two . Being so upset Elsa accidentally reveals her power . Upon the guests' and her subjects' horror and being accused of sorcery and called a monster, Elsa flees the castle and retreats into the icy mountains . In the process, her emotions unleash an "eternal" winter throughout Arendelle . While there, she decides to embrace, finally, all her powers and builds an enormous ice palace where she believes she can live freely without fear of hurting people . She also rebuilds her childhood snowman, Olaf, and unknowingly brings him to life . </P> <P> Anna, determined to find Elsa and bring her back, travels through the mountains, encountering Olaf and a mountain man named Kristoff . They reach the ice palace, where Anna attempts to persuade Elsa to return home and mend their relationship . When Elsa ultimately resists (due to her memory of hurting Anna as a child with her powers resurfacing) Anna tells her about the state that Arendelle and all its people was left in . Horrified, Elsa lashes out and accidentally freezes Anna's heart . Now even more horrified at the prospect of hurting her sister and people with her powers, Elsa forces Anna, Kristoff and Olaf out by creating a gigantic snow creature (called Marshmallow by Olaf), that is a symbol of her desire to be alone so as to be able to use her powers without hurting anyone . After this, her ice castle evidently becomes darker and more grotesque, reflecting her torment and re-ignited fears . Meanwhile, Anna becomes weaker day by day and Kristoff takes her back to the trolls, who tell them that only an "act of true love" can save her life . </P>

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