Seen in Macau: Granite sidewalks

Seen in Macau: Granite sidewalks, originally uploaded by mdelamerced.
The old sidewalks of Macau are covered in these black and white
granite tiles. It’s quite fascinating to look at but what heppens when
it rains? Doesn’t it get all slippery and you fall down? Especially on
the downward slope of the hills?