Final answer:
Tension eases in a literary or artistic excerpt when descriptions move from tense to calm, such as a hand pressing in support or the placement of a heel on the ground, indicating a character's relaxed posture.
Step-by-step explanation:
The detail identifying the point where tension eases in a literary or artistic excerpt could be a subtle change in the description of characters or settings. For instance, the mention of an elder-hand pressing receiving supporting or the description of an outlet, relief, and escape could indicate a moment of relaxation or release of tension.
Similarly, in visual arts, the transition from tense to relaxed postures, such as the heel of a figure being placed firmly on the ground or the absence of fluttering draperies, can signify a reduction in tension. Observing these subtle cues is essential to understanding the narrative or emotional trajectory within the work.