This sentence is pretentious because:
* It uses overly complex and obscure words ("ineffable," "celestial tapestry") where simpler ones would suffice ("beautiful," "sunset with red and gold colors").
* It uses unnecessarily elaborate phrasing ("ignited a profound sense of existential awe") instead of something more straightforward ("made me feel deeply moved").
* It attempts to sound profound and insightful by using abstract and lofty concepts ("existential awe"), but it lacks genuine meaning or depth.
In contrast, a simpler and more genuine sentence could be: "The sunset was so beautiful, it made me feel really small and connected to something bigger than myself." This sentence expresses the same sentiment without the unnecessary flourish and pretentiousness.