Yes, you can invent your own martial art. Many martial arts have been developed by individuals who combined elements of different styles or created entirely new techniques. To create your own martial art, you can draw inspiration from your own experiences and knowledge of different styles, and then develop a unique system of techniques, forms, and principles. It's important to study and understand the fundamentals of martial arts before creating your own, and to ensure that your techniques are safe and effective. **

Yes, it is allowed to invent cities in books. Authors have the creative freedom to imagine and create fictional worlds, including cities, in their writing. Inventing cities can add depth and richness to the story, allowing the author to explore different themes, cultures, and settings. Fictional cities can also serve as a backdrop for the characters and plot to unfold in unique and imaginative ways. **

When designing a cover page for art, consider using a visually striking image that represents the theme or subject of the art. You can also incorporate elements such as bold typography, color schemes, and textures that complement the artwork and create a cohesive design. Additionally, think about the overall mood or feeling you want to convey with the cover page and use design elements to evoke that emotion. Lastly, make sure to balance the visual elements and negative space to create a clean and impactful design. **

When designing a cover page in art, consider the purpose and theme of the project or document. Use visual elements such as color, composition, and imagery to create a visually appealing and cohesive design. Incorporate typography that complements the overall aesthetic and effectively communicates the title or main message. Experiment with different techniques and mediums to add depth and interest to the cover page, and don't be afraid to let your creativity shine through. **

Some good books for art students or interior design students include "Color: A Workshop for Artists and Designers" by David Hornung, which provides a comprehensive understanding of color theory and its application in art and design. "The Interior Design Reference & Specification Book" by Chris Grimley and Mimi Love is a valuable resource for interior design students, offering essential information on materials, finishes, and construction techniques. "Thinking with Type: A Critical Guide for Designers, Writers, Editors, & Students" by Ellen Lupton is a must-read for students interested in typography and graphic design, providing insights into the principles of typography and its role in visual communication. **

Cassandra Clare did not invent the concept of runes, as they have been a part of various mythologies and cultures for centuries. However, she did incorporate them into her popular young adult fantasy series, The Mortal Instruments. In the books, the runes are magical symbols that Shadowhunters use to enhance their abilities. Clare has described the runes in detail throughout the series, and there are also illustrations of the runes included in the books. These images help readers visualize the magical symbols and understand their significance in the story. **