One will often see these inverted V-shaped things on buildings, particularly schools, in Kumamoto. This is called “seismic retrofit” (耐震工事, たいしんこうじ) and is intended to reduce the horizontal stress that a building undergoes during an earthquake. (Presumably, newer buildings incorporate them.) But this story about a building in China that suddenly started shaking even with no seismic activity is startling. Architectural integrity is paramount. - William
https://www.theguardian.com/world/2021/may/18/panic-as-300m-high-tall-skyscraper-wobbles-in-china