Are fear and desire located on the opposite sides of a spectrum or are they more like filters/lenses through which one can look simultaneously?
The Atlas of personality, emotion and behaviour (Mobbs, 2020) is able to visualise emotions in two dimensions: affiliation and dominance. Fear is considered submissive and disaffiliative. Desire is more dominant and intrapersonal, that is, in itself neither affiliative or disaffiliative.
Mobbs AED (2020) An atlas of personality, emotion and behaviour. PLOS ONE 15(1): e0227877. https://doi.org/10.1371/journal.pone.0227877
I am the author of the atlas paper.