Design a black and white symmetrical playing card back in the style of ornate victorian and mechanical design. the card back should have a unique design, with elements of symmetry and repetition, flat with no shadow, no script, while still maintaining a cohesive look and feel throughout the deck. the overall design should evoke a sense of imagination and adventure, suitable for use in both casual and formal card games. the final product should be high-quality, vector artwork, suitable for printing on standard playing cards.