Day and Night Beach Hourglass

Create a vertical surreal fantasy photorealistic image of a large transparent crystal hourglass floating against a deep star-filled cosmic background. Inside the hourglass are exactly two miniature ocean beach worlds: the upper bulb contains a bright daytime tropical beach with golden sand, turquoise waves, rocky green cliffs on the left, distant blue islands on the horizon, towering white cumulus clouds on the right, and exactly one blazing sun near the upper left; the lower bulb contains the same beach at night with dark blue water, moonlit waves, shadowy islands, dramatic clouds, and exactly one full moon centered above the horizon. A narrow waist in the glass connects the two scenes, with exactly one continuous stream of sparkling golden sand and stardust falling from the sunny upper beach into the moonlit lower beach, forming a glowing pile at the bottom. The hourglass glass should be thick, glossy, highly refractive, and rimmed with bright highlights and caustic reflections. Make the composition symmetrical and centered, with the upper scene feeling warm and radiant and the lower scene feeling cool, nocturnal, and magical. Use ultra-detailed cinematic realism, high dynamic range lighting, luminous ocean reflections, glittering sand particles, sharp focus, rich blues and golds, and a dreamlike contrast between day and night. Customize the setting as {argument name="beach location" default="tropical island beach"}, the upper sky as {argument name="daytime sky" default="bright blue sky with towering white clouds"}, the lower sky as {argument name="night sky" default="deep starry sky with a full moon"}, the sand effect as {argument name="falling sand effect" default="sparkling golden sand and stardust"}, and the overall mood as {argument name="overall mood" default="surreal magical cinematic realism"}.