Final answer:
The expressiveness of a product's formal qualities can be inherent in its form or be influenced by external factors such as context and viewer perception.
Step-by-step explanation:
The two explanations for the expressiveness of the formal qualities of a product are that expressiveness is inherent in the form and that it is expressive only through external factors. The formal qualities of a product, such as its shape, color, and composition, can evoke certain emotions and convey meanings on their own. However, the second explanation posits that the expressiveness of a product can also be influenced by factors outside the product itself, such as its historical and cultural context, the way it is presented, or the personal experiences and perceptions of the viewer.