Created by Brazilian agency Heads Propaganda, these thought-provoking poster ads draw attention to the fact that many cyclists are knocked down at night due to the lack of respect by the motorists who share their roads.

“I like to draw simple, creepy and weird illustrations on feet pictures of friends and people. When nobody volunteers I do it on my own feet. Everything is being done on the phone only”. – Uttam Sinha

An environmental activist adjusts his mask while taking part in “The Dead Sea Swim Challenge”, swimming from the Jordanian to Israeli shore, to draw attention to the ecological threats facing the Dead Sea, in Kibbutz Ein Gedi, Israel November 15, 2016. Swimmers from around the world plunged into the salty waters of the Dead Sea on Tuesday to attempt a seven-hour swim across the fabled lake in a bid to draw attention to its environmental degradation. Wearing protective masks and snorkels, 25 swimmers paddled through the muddy water to attempt the 9-mile (15-kilometer) swim from Jordan to Israel. (Photo by Nir Elias/Reuters)

Bunting hangs on Regent Street on April 19, 2011 in London, England. Preparations are underway across the city as the Royal wedding of HRH Prince William and Kate Middleton draws nearer. (Photo by Dan Kitwood/Getty Images)

Massive, roiling, atomic explosions are the central subjects of The Sickness of Reason, Robert Longo's exhibition of large, highly detailed, and intensely black charcoal drawings.

Hey Everybody! My name is Chris Ryniak (RYE-KNEE-ACK), and I make monsters. I split my time between sculpting and painting for gallery work, designing toys and being a Dad, but the thing I do the most is DRAW MONSTERS, like every day.

Indian dancers paint their body like tigers as they perform a Tiger dance during the International day of the Tiger in Calcutta, India, July 29, 2015. Students of Calcutta are taking part in an awareness campaign aiming to draw attention to the threats that tigers face due to habitat loss and poaching. (Photo by Piyal Adhikary/EPA)

The combination of two different drawing styles in one picture never ceases to amaze us. The works of Allison Kunath are a vivid example of this technique. The background of her pictures is drawn using watercolors, while the actual image is broken down into rough geometrical shapes. This creates a very striking contrast, thanks to black, bold lines of the image on the forefront drawn over soft, cloudy shades of color. The skill of Allison is clearly seen in the way she manages to draw something as amorphous as a squid without making any curved lines. (Photo by Allison Kunath)