Imagine a Christmas-themed house with an organic architectural style, blending harmoniously into the natural landscape of the mountains. The house is designed with flowing, curvilinear shapes and materials that mimic the forms of nature, like stone, wood, and glass. The exterior features large windows that offer panoramic views of Barcelona in the distance, with the sparkling city lights visible on the horizon. The house is decorated for Christmas, with festive lights, a large wreath on the door, and cozy touches like candles and garlands. Snow is gently falling, covering the roof and surrounding pine trees, adding to the winter wonderland atmosphere. The warm glow of interior lights shines through the windows, creating a welcoming contrast with the cool winter evening outside