- Sierpiński triangle (Wikipedia)
The Sierpiński triangle, also called the Sierpiński gasket or Sierpiński sieve, is a fractal with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles. Originally constructed as a curve, this is one of the basic examples of self-similar sets—that is, it is a mathematically generated pattern that is reproducible at any magnification or reduction. It is named after the Polish mathematician Wacław Sierpiński, but appeared as a decorative pattern many centuries before the work of Sierpiński.
- Columbia Center (Wikipedia)
The Columbia Center, formerly named the Bank of America Tower and Columbia Seafirst Center, is a skyscraper in downtown Seattle, Washington, United States. The 76-story structure is the tallest building in Seattle and the state of Washington, reaching a height of 933 ft (284 m). At the time of its completion, the Columbia Center was the tallest structure on the West Coast; as of 2017, it is the fourth-tallest, behind buildings in Los Angeles and San Francisco.