Can you define 'completely temporary?' A chef paid to create a once in a life time meal for something like this is honing their craft. An Ice Sculptor is prob

Can you define 'completely temporary?' A chef paid to create a once in a life time meal for something like this is honing their craft. An Ice Sculptor is probably creating their masterwork. The biologists he used may have never had a chance to work on conserving an area this large. An architect builds houses that the wind will erode away over the next 500 years. How permanent does something need to be to make the creation of it worthwhile?