It is quite common for an Art Gallery to have only limited quantity of an artwork that are available to sell. Customers can choose different Frame options that are priced differently. Some of the times, customers are allowed to buy a different sizes too.
Regardless of the sizes and frame option customers end up choosing, the Art Gallery can always only sell a limited quantity of the same piece of artwork.
This is a common setup at Shopify backend for an Art Gallery. Each piece of artwork has variant options by Sizes and Frame options.
In this example, this Art Gallery wants to sell only 10 pieces of this artwork regardless what size and frame option that customer is choosing.