Incorporate wind vanes into a coastal zen garden to create a sense of tranquility and harmony. Choose minimalist wind vanes with clean lines and simple designs, such as bamboo or geometric shapes. The wind vanes will add a subtle movement and create a calming effect as they sway with the breeze. Surround the area with sand, pebbles, and carefully placed rocks to mimic the coastal landscape. Add a small water feature, such as a mini waterfall or a koi pond, to complete the zen atmosphere.