Human population growth amounts to around 1 % per year. The global population has grown from 4 billion in 1970 (when the author was a student) to 7 billion in 2012. It is expected to keep growing to 9.6 billion by 2050. Visually breaking down the population by age and sex means showing population pyramids, which also sheds light on some aspects of country development.
MeliesArt took the shapes of http://populationpyramid.net/ Source: United Nations, Department of Economic and Social Affairs, Population Division. World Population Prospects: The 2015 Revision. (Medium variant) and Made by @madewulf to design physical shapes with voumes that represent the respective population sizes for continents and the years 1950, 2000 and 2050. All forms of pyramids exist here (
Stable, Stationary, Expansive and Constrictive pyramids). They can be ordered at Sculpteo (http://www.sculpteo.com/de/gallery/?search=Meliesart): Hold them in the palm of your hand and you will get an incredible impression on the growth patterns of our species and how different the development of the African population is.