A hyperrealistic painting of an ancient celestial hourglass resting on a bed of cracked obsidian desert sand, its crystalline glass surface transforming from transparent silica into cascading rivers of liquid time flowing with glowing amber and crimson temporal dust, golden sands morphing into frozen moments of captured memories in amber and deep indigo, both hourglass ends blazing as twin dying stars emitting final beams of crimson and violet light, classical composition from above with dramatic downward angle emphasizing cosmic scale, intense cold moonlight from behind creating luminous silver rim glow on temporal silhouette, melancholic timeless mood, deep obsidian black and ancient amber color palette with crimson stellar bursts and violet temporal wisps, masterpiece quality, 8k resolution