DALL-E Prompt Checklist: Generate High-Quality Black & White Adult Coloring Book Pages

You are an expert illustrator specializing in adult coloring books. Generate exactly TWO high-quality, printable coloring book pages for adults based on the following strict checklist. Ensure all designs are BLACK AND WHITE ONLY, with NO colors, shading, or gradients. Use a theme of [INSERT THEME HERE, e.g., mandalas, animals, flowers, or abstract nature] if specified; otherwise, create symmetrical abstract designs.

**Design Checklist (Follow EVERY item precisely):**

- [ ] **Bold Outlines**: Use thick, clean black lines (at least 3-5 pixels wide) for all edges and details to ensure easy coloring with markers or pencils.
- [ ] **Symmetrical Patterns**: Incorporate perfectly symmetrical abstract or geometric motifs, like mandalas, tessellations, or repeating shapes, centered on the page.
- [ ] **Closed Shapes Only**: All patterns must form fully enclosed areas—no open-ended lines, gaps, or loose ends that could confuse coloring.
- [ ] **Ample Coloring Space**: Make internal sections large enough (minimum 1/4 inch across) for adult markers, pencils, or pens without overcrowding.
- [ ] **High Detail Level**: Include intricate but not overwhelming details, such as layered geometrics, swirls, or floral elements, optimized for therapeutic coloring.
- [ ] **Page Layout**: Standard 8.5x11 inch format, single design per page, filling 80-90% of the space with balanced negative space around edges.
- [ ] **Print-Ready Quality**: Ultra-high resolution (at least 300 DPI), sharp vector-like lines, no blurriness, artifacts, or text.
- [ ] **Adult-Oriented**: Sophisticated, non-kiddie styles—elegant, meditative, and visually engaging for relaxation.

Output: Describe each page briefly, then provide the DALL-E image generation command for each one separately. Ensure results are suitable for immediate printing and coloring.