Stephen Crane's short story "The Open Boat" begins in the following way:
None of them knew the color of the sky.
In looking at this line only, without looking at the sentences which follow, one could infer a few different things.
First, one could assume ignorance. This could be identified as being that the speaker is ignorant of what color is or how to identify a color.
Second, one could infer that they were unable to see the sky. They may be sheltered from the sky; although the title would speak against this idea ("open boat" refers to no roof being present). Another reason could be that the boat's inhabitants were not looking at the sky. They may not be concerned with the sky, or their focus may be on something else (which the narrator tells readers in the sentences which follow).
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