People wearing protective face masks amid the coronavirus disease (COVID-19) outbreak are seen near foodstuffs, which are displayed for sale on a car in Omsk, Russia on December 4, 2020. (Photo by Alexey Malgavko/Reuters)

A vendor holds a teddy bear for sale on Valentine's Day in Port-au-Prince, Haiti, Monday, February 14, 2022. (Photo by Joseph Odelyn/AP Photo)

A large variety of weapons were for sale at the Washington County Fairgrounds Gun Show that drew thousands of people over the weekend, on March 22, 2013. (Photo by Gary Porter)

Shoppers walk past crocodiles for sale at a market in Bata on February 3, 2015. Markets in Equatorial Guinea sell a variety of animals including pangolins, monkeys and crocodiles as food. (Photo by Carl De Souza/AFP Photo)

Ice covers oranges on a tree creating a protective shell in a commercial grove January 11, 2010 near Winter Garden, Florida. (Photo by Matt Stroshane/Getty Images)

Only with a pencil, ruler and protractor, without the help of a computer, Venezuelan artist Rafael Araujo creates complex fields of three dimensional space where butterflies come to life and shells rise from mathematical spirals.

A competitor calls with a shell at the German championships in Deer-Calling at the “Jagd & Hund” (hunting & dog) exhibition in Dortmund February 6, 2015. Competitors use specially designed instruments or ox horns to imitate the mating call of red deers. About 750 exhibitors will present their latest developments at the 34th “Jagd & Hund” exhibition, which runs from February 3 to February 8. (Photo by Ina Fassbender/Reuters)

“Izhevsk Machinebuilding Plant (Russian: Ижевский Mашиностроительный Завод) or IZHMASH (ИЖМАШ) is a weapons and motor vehicle manufacturer based in Izhevsk, founded in 1807 at the decree of Tsar Alexander I, and is now one of the largest corporations in its field. It manufactures the famous Kalashnikov series of assault rifle, along with a host of other Russian arms, including medium cannons, missiles, and guided shells”. – Wikipedia. (Photo by Pismoshnaya.ru, 2012)