. In the poem “The Cross of Snow,” Longfellow writes the following lines:
In the long, sleepless watches of the night,
A gentle face—the face of one long dead—
Looks at me from the wall, where round its head
The night-lamp casts a halo of pale light

What can we infer he is describing in these lines?

looking into a mirror
an imagined vision of his dead wife
a memory
a portrait of his dead wife