Sierpinski triangle

A Sierpinski triangle or Sierpinski triangle gasket is a fractal resulting from doing the following:^[1]

• Start with an equilateral triangle.
• Remove center part.
• Do the same for the three largest equilateral triangles left in this one.

If this is done, the first few steps will look like this:

If this is done an infinite number of times, its area will be 0.

They can also be 3D: