Twin brothers Jörg and Rolf Fischer sleep together at Rolf's dormitory in Germany. Both were born deaf, and they have lost their eyesight because of diabetes -- although Rolf can still see a little bit out of one eye. Photographer Marlena Waldthausen spent a few months with the twins and learned how they navigate the world together.
Like most deaf-blind people, the twins use tactile sign language. They take each other's hands and form signs with the hands and arms of the other. They also use the Lorm alphabet, where every letter corresponds with a point on the palm. Over the years, they've even developed their own signs -- so their conversations are often hard for outsiders to understand.
Jörg pushes Rolf through the water during their weekly swim therapy.
The twins spend some time at the beach.
Jörg enjoys a short break during strength training.
Jörg and Rolf´s parents drew the Lorm alphabet on gloves. The Lorm alphabet was developed by Hiernoymus Lorm in 1881 to enable communication with deaf-blind people.
Jörg is sad that there is no dog costume as he and his brother shop for Carnival costumes.
Jörg practices typing on a braille typewriter. His parents made him a wooden board with small wooden pins so he can feel the letters.
The twins are fascinated by light reflections at a museum's disco room.
The twins have lunch at their parents' house. Before retiring, their father worked as a chef for the German Red Cross. Rolf used to help in the kitchen when his sight was better.
The twins head home in a taxi after a weekend with their parents.