[Answer] Where is this city square with distinctive wavy pavement?

Step 1 : Introduction to the question "Where is this city square with distinctive wavy pavement?"

...1. Lisbon 2. Singapore 3. Zurich 4. Buenos Aires

Step 2 : Answer to the question "Where is this city square with distinctive wavy pavement?"

Lisbon - Patterned mosaic-style pavement, or calçada, is a common feature of Portugal’s cityscapes. It made its first appearance in the 1840s at a Moorish castle overlooking Libson, Castelo de São Jorge, but didn’t take long to spread to other parts of the city. King Pedro IV Square (commonly known as Rossio Square) in downtown Lisbon was soon paved in black-and-white waves. The pattern, which also appears elsewhere in the city, is said to reference Portugal’s maritime heritage. All kinds of geometric designs have since sprouted up on Lisbon’s sidewalks and plazas, as well as elsewhere in the nation and its former colonies such as Brazil. A special school trains new calceteiros, or pavers, but the profession is now in jeopardy as younger people flock to other jobs.:

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