The phrase "inward eye" is often used in poetry and literature to describe a person's imagination or inner vision. There are several synonyms for this phrase that can be used interchangeably. One of the most common is "mind's eye", which implies a mental image or perception. Another synonym is "inner vision", which emphasizes the personal, subjective nature of this experience. Other possible options include "mental imagery", "internal sight", or "imagination". Ultimately, the choice of word will depend on the context and the author's intended meaning, but all of these synonyms capture the idea of an individual's internal world of thoughts and perceptions.