Why does tim burton use high key lighting

In a flashback scene, it shows the opening of the Chocolate Factory. In this scene, Burton uses high key lighting to make the scene bright and also uses bright and diverse colors to create a lighter mood and a more childlike scene.  

Explanation:

first aid for seizures is aimed at keeping the person safe until the seizure stops on its own. stay calm, loosen anything around the person's neck, do not restrain them or put anything in their mouth, clear the area around them, and stay with them after the seizure stops.

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