Material aspects: In the sense of being dark or dim, anything obscured in dreams requires us to uncover what is hidden and to discover the relevance in everyday life. We may not have the full facts of a situation.
If we are able to admit in waking life that something is unknown, an image in recurring dreams, which has previously been obscured, becomes clear.
[1]Psychological / emotional perspective: When we have not clarified how we feel about something, a representative image can often be obscured in dreams.
[2]Obscurity originally signified the absence of light, so spiritually has that connotation.
The truth has not yet been revealed.
[3]