A smile dissolved gratitude and grudges

They could also listen to Mba explain what window lattice patterns and rainforest vine patterns had in common—"Both use patterns to keep what you want and shut out what you don't." Three, a digital upgrade for cave dwellings: letting AR "reveal the history of warmth." Lina and Nikos optimized the "Pattern Tracking" technology for the enclosed, heat-retaining environment of cave dwellings and developed "Northern Shaanxi Cave Dwelling AR Glasses": scanning a "window lattice pattern" with the glasses brought up an animated cold-resistance simulation, marking how effectively different window patterns blocked wind and admitted light; users could also switch perspectives to see scenes of people in Northern Shaanxi cutting window lattice decorations and building earthen kang beds in earlier times. Scanning the "Kang-Brick Pattern" displayed an animation of Hu Fei demonstrating the Cave Dwelling Warm-Home Step, overlaid with the Hakka Tulou Ring Formation Step and Lingnan's Arcade Pillar Step, allowing the youngsters to see directly "how patterns around the world resonate in preserving warmth." Hu Fei also proposed adding "AR saber techniques explaining warmth": scanning the "earthen kang diamond pattern" brought up details of the brick patterns marked with lines of saber light, explaining how each brick's angle corresponded to the contours of the loess slopes and how it improved the kang's heat retention. While exploring with the AR glasses, Shitou discovered a brick engraved with a special diamond pattern in a corner of the earthen kang. Grandpa Wang took one look and said with a smile, "That's a 'heartwarming brick' your great-grandfather laid specially when he built the kang! He said it would keep the head of the kang the hottest spot forever!" Four, warm winter moments at the Cave Dwelling Pattern Festival: saber light reflected warmth-preserving patterns. To bring Northern Shaanxi's cave dwelling patterns to the world, the Pioneer Team, the Cave Dwelling Protection Association, and Hu Fei jointly held the "Northern Shaanxi Cave Dwelling Pattern Festival." On the day of the festival, the cave dwelling village bustled with activity: youngsters dressed in traditional Northern Shaanxi clothing—the boys in sheepskin coats and the girls in floral cotton shirts—performed the Cave Dwelling Cold-Resistance Fist in the cave dwelling courtyards, moving with the Cave Dwelling Warm-Home Step; Shitou led everyone in using yellow clay to imprint a giant "Window Lattice Wan Character Pattern" on a wall, while Hu Fei traced "diamond patterns" on the earthen kang bricks with saber light, the two interweaving into a spectacular design of "warmth-preserving patterns encircling cave homes"; standing beside a cave dwelling's window lattice with the Cold Moon Saber in hand, Hu Fei performed the Warm Snow Melting Cold form in the warm glow of the firewood, his saber light reflecting the light and shadows of the window lattice, like "a wandering hero guarding the warmth of a cave home"; through live video links, the Global Patterns Service Station showcased the different regions' "warmth-preserving patterns": Hakka tulou sent images of "ring patterns reflecting reunion," Lingnan arcades displayed scenes of "pillar patterns reflecting commercial streets," and the Congo Rainforest Service Station used AR technology to project "vine patterns" onto the cave dwelling walls, forming a "global map of warmth-preserving patterns." Before they left the cave dwellings of Northern Shaanxi, Grandpa Wang gave Muhammad a yellow clay pendant engraved with "window lattice wan character patterns + earthen kang diamond patterns," its edges also inlaid with fragments of Snow Mountain Cold Iron gifted by Hu Fei and pieces of Hakka red earth: "This pendant has felt the warmth of a cave dwelling's firewood and holds the warmth of civilizations around the world. It's a keepsake of a warm home that reaches across mountains and seas." Patting Shitou's shoulder, Hu Fei said, "In the future, you must pass the stories of how cave dwelling patterns preserve warmth on to more people, so Northern Shaanxi's cave dwellings will always have 'warm kangs and bright windows'!" That winter solstice, Muhammad returned to Chen Jialuo's Tomb in Hangzhou with the yellow clay pendant and a Cave-Dwelling Warm-Home Ornament. Beside the Silk Road Heritage Stele, another new token was added—the window lattice and brick patterns on the yellow clay pendant interwove with tokens such as Northern Shaanxi loess, Hakka red earth, Lingnan Manchurian windows, and Southern Fujian red bricks, like a "picture of civilizations around the world preserving warmth and thriving together." Watching a replay of the Cave Dwelling Pattern Festival through the AR glasses, Di Yun said with a smile, "From the snowy mountains to the cave dwellings, our heritage really has woven the world into a 'warmth-preserving network of patterns'!" Muhammad opened the Global Pattern Digital Platform, where the screen was playing footage of Shitou leading the village children in pasting newly cut