A photography technique that frequently catches my eye is the use of silhouette - placing a subject directly between a primary light source and the camera. The effect can be painterly or haunting or evocative. It can break a subject down to basic ideas conveyed only by line and shape, where an individual might appear iconic. Collected here are a handful of recent photographs from around the world, where we can only see the outlines of the subject, our minds (and the captions) are left to fill in any details in the darkness. Australian freestyle motocross rider Robbie Maddison jumps during an training session in the Sahara desert near the Giza pyramids as the sun sets in Cairo May 11, 2010 in preparation of the second stage of the Red Bull X-Fighters World Tour. Volunteers release flamingo chicks at the Fuente de Piedra natural reserve, near Malaga, in southern Spain August 7, 2010. Around 600 flamingos are ringed and measured before being placed in the lagoon, one of the largest colonies of flamingos in Europe, according to authorities of the natural reserve. South African kids play soccer in open field as sun sets in Soweto, South Africa.