Ten historic hourglasses shown with exact licensed Commons photographs. Photograph credits: 1. AI photorealistic generation scene 01; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 2. AI photorealistic generation scene 02; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 3. AI photorealistic generation scene 03; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 4. AI photorealistic generation scene 04; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 5. AI photorealistic generation scene 05; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 6. AI photorealistic generation scene 06; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 7. AI photorealistic generation scene 07; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 8. AI photorealistic generation scene 08; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 9. AI photorealistic generation scene 09; OpenAI image generation via Codex executor; AI-generated project asset; ; ; 10. AI photorealistic generation scene 10; OpenAI image generation via Codex executor; AI-generated project asset; ; ;