Final answer:
A horse shows interest by having its ears hole forward, intensive gaze, head raised, and possibly moving towards the object. Such signs are often portrayed in art and literature to depict the horse's emotions and responses.
Step-by-step explanation:
Signs Indicating a Horse's Interest
The signs that a horse is very interested in what it sees involve various body language cues. When a horse is alert and focused, you might notice its ears hole forward, its gaze intense, and possibly its body leaning towards the object of interest. This level of engagement shows that the horse is paying close attention and is curious about its environment. Additionally, a horse might raise its head high to get a better view or even move toward what it has seen to investigate further. In fiction and art, these signs are often emphasized to depict a horse's emotion and response to its surroundings, just as in the passages provided that illustrate horses' responses to different stimuli.
On a broader note, horses as depicted in various art forms, like the Blue Horse I by Marc and in literature, convey a wide range of emotions and physical states through color, form, and narrative context. While these artistic interpretations might be more abstract or symbolic, they still often rely on the understanding of the horse's natural behavior and body language to communicate interest or other emotions.