1) BEAM robotic 
In BEAM robotics, a Phototrope is a robot that reacts to light sources. Literally, `light turning,` this term is generally (if somewhat inaccurately) applied to light-seeking robots. More accurately, phototropes can either seek (photophiles) or flee (photophobes) bright sources of light. The simplest and most common form of phototrope is the pho.....