In Nature, when an object is hit by light, its shadow appers. This simple principle, however, doesn’t seem to apply to the light tube, a modern object invented in 20th century. Because when a light tube shines, it is not able to reflect its own shadow despite the fact that is also an object. Here I use fluorescent paint to outline a light tube, so it looks like having its own shadow when it shines. On the other hand, the fact that fluorescent paint only shines under fluorescent light also makes this painted shadow belong to the fluorescent light. With this gesture of outlining, I attempt to draw the portrait of a certain existence.