Provide a detailed, step-by-step mechanism for the reaction shown below. 
Definitions:
Plaster Sculptures
Artworks made by shaping or casting plaster, a versatile material, into three-dimensional figures or forms.
Open-Air Settings
Open-Air Settings refer to outdoor locations utilized in the creation or display of art, especially noting the practice of plein air painting that captures landscapes and scenes directly from nature.
David Smith
An influential American sculptor known for his large-scale steel abstract works, contributing significantly to the development of modern sculpture.
Conceptual Art
An American avant-garde art movement of the 1960s whose premise was that the “artfulness” of art lay in the artist’s idea rather than its final expression.
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