Among most of the weird animals I saw, firefly squids always got my attention and got me thinking about the possibilities of future technology and application.
"The firefly squid is a small member of the squid family, growing to a length of only three inches (seven centimeters). The squid is equipped with special light-producing organs called photophores. These photophores are found on many parts of the squid's body and emit a deep blue light. Large photophores can be found on the tips of the tentacles as well as around the eyes. Thousands of tiny photophores can be found throughout the squid's body, giving it the ability to emit light along its entire form. The lights can be flashed in unison or alternated in an endless number of animated patterns. These light shows are thought to serve several functions. They can be used to communicate with potential mates or rivals. They may also be used to disguise the squid's shape and confuse predators, allowing it to escape. The firefly squid is the only member of the squid family that is believed to have color vision. While most cephalopods have only one visual pigment, firefly squid have three. They also have a double-layered retina in the back of the eye. These adaptations for color vision may have evolved to enable firefly squid to distinguish between ambient light and bioluminescence, and to help them decode the patterns of light created by other members of the species." (http://www.seasky.org/deep-sea/firefly-squid.html)
I have always been imagining if there is a way to 'program' these photophores and put them into human skin. this is probably the most organic way of putting a 'screen' on our body. Just like the photophores on the squids appear as dots. These 'dots' can be viewed as 'pixels' and can display various types of information such as time, weather, even medical conditions. For further development if these "bio-pixels" can be arranged in a more sophisticated and meticulous level it might even achieve a 'actual screen' on human body without using too much hardware. A minimum amount of the electric charge can activate the illumination. It will be amazing to ditch the physical phones on our hands and use our body as the display.