A captivating visual concept of time, where a colossal hourglass sits in the cen

A captivating visual concept of time, where a colossal hourglass sits in the center, with sand flowing through the narrow neck. On one side, there's a vintage, steampunk-inspired city, and on the other side, a futuristic, high-tech metropolis is emerging. The sky is a blend of pastel colors, with a celestial body visible in the distance. The overall ambiance of the image is thought-provoking and awe-inspiring, capturing the essence of the passage of time.