A hyperrealistic portrait of an ancient obsidian hourglass, its solid black glass body transforming from polished midnight stone into cascading infinite time rivers flowing with liquid silver and gold particles, swirling galaxies spiraling within each glass chamber, glowing cosmic dust motes floating around fractured timeline fragments, classical dramatic composition with low-angle perspective emphasizing the hourglass's imposing height, intense warm candlelight from below creating ethereal rim glow on obsidian edges, melancholic reflective mood, deep obsidian black and ancient bronze color palette with luminous silver time stream and golden stardust accents, masterpiece quality, 8k resolution