Final answer:
Without specific context from a known text, it's challenging to provide an accurate response. However, it can be hypothesized that Robert helps the narrator to engage in an imaginative experience to visualize a cathedral, akin to how an artist captures the essence of a subject in various lights.
Step-by-step explanation:
The question seems to reference a storyline involving Robert and the narrator and likely pertains to a literary discussion, possibly one related to analyzing the characters' experiences or the thematic elements of a narrative involving a cathedral. However, due to a lack of specific context from a known text, it is challenging to provide an accurate answer regarding what Robert had the narrator do to visualize the cathedral. Typically, in literature, a character like Robert might guide the narrator to engage in a sensory or imaginative experience to visualize something like a cathedral, possibly through description, drawing, or a shared imaginative exercise. This would provide a multi-dimensional understanding that extends beyond mere physical vision.
In the context of visual arts, as mentioned in the excerpts provided, artists like Monet have represented cathedrals through various lights in their paintings, capturing the nuances of specific moments. Robert's act of helping the narrator could be a metaphorical reference to seeing the cathedral in a different light, much like how an artist might do so. However, without a direct link to a specific piece of text, any further interpretation would be speculative and possibly inaccurate.