Sets of visual renderings of fractals.
Because of the large number of calculations needed to create fractal images, computers must be used to create them. The first Mandelbrot and Julia set images only became available from the mid to late 1970's onwards.
Requiring even more computer power, the first three dimensional fractal structures - such as the Mandelbulb and Mandelbox - were fully developed and visualised only from the end of the first decade of the 21st century.
On a PC running Ubuntu Linux, with a 1.25 GHz processor and 1GiB of memory, the 2D Mandelbrot and Julia Set fractals were rendered in a few minutes. At the higher resolutions and levels of accuracy I chose, the 3D Mandelbulb and Mandelbox fractals typically took a whole 24 hour day each to render.