A more thorough explanation:

Definition: Aesthetic functionality refers to the quality of a product's design, shape, configuration, or color that is so superior to other available options that giving the first user exclusive trademark rights would hinder competition. It also refers to the doctrine that denies protection to a product's design or container when it is necessary for the product to function as intended.

Trademark: Imagine a company creates a new type of water bottle with a unique shape and design that is so visually appealing that it stands out from all other water bottles on the market. If the company were to trademark this design, it would give them exclusive rights to use it, making it difficult for other companies to compete. This is an example of aesthetic functionality in trademark law.

Product Design: Let's say a company creates a new type of phone case that has a built-in stand to prop up the phone. The design of the case is necessary for the stand to function properly. Therefore, the design cannot be protected under aesthetic functionality because it is essential to the product's intended use.

These examples illustrate how aesthetic functionality can impact both trademark law and product design. It is important to consider whether a product's design is necessary for its intended use before seeking protection under aesthetic functionality.