Produce a brightly colored birthday-themed illustration. At the center of the composition, include a smooth, high-speed racing bike prominently displaying the number '21' on its frame. The background should consist of a playful interpretation of Newcastle, showcasing its iconic landmarks in a subtle manner. Scatter festive balloons and streamers throughout the scene to emphasize the jubilant atmosphere.

Generated with these themes: Racing bike, 21, and Newcastle .

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