Einsteins speed of light is said to be constant to all observers. Known has C, the speed is recorded at 299 792 458 m / s, and this is said to be a constant speed, observed by all observers. I would firstly argue the observed part, observed being a visual, and we can not directly observe light, we can only measure the electromagnetic wave. The constant being a quantity, I would like to mention the other constants involved, that are observed, but have no quantity, but are constant by observation. 3 dimensional space is observed by all observers, as a constant, what is is referred to as white light in empty space. Sight is constant to all observers, we all see at an equilibrium to the white light, and see white light in 3 dimensional space, as invisible light, and not visible light. And we all observe seeing objects through the invisible empty space, of 3 dimensional space. Dark, constant to all observers, without EM frequencies present, all observers observe dark,and observe dark to be opaque to sight. From my observations , I would perceive that dark, is transparent to light, and allows light to pass through it, making the dark , see through to our eyes. From my observations, I would also perceive , that all matter , except when in shade, is submerged in an ocean of EM radiation. I would argue that light is not constant to all observers, on the basis that a species which is deemed to have night vision, would if they could talk, argue that at night , it is still light , when we would perceive it to be darkness. I would also argue that, we live within the constant, and only by interaction of EM radiation with matter, do we notice a change in the constant state. I would also argue that light is not a thing, and it is always dark, on the basis that light is emitted , to make dark light, where dark, is the absence of light, and nothing is added to make dark, it exists has a natural state. I would also argue that like the other species, who evolved to see using low levels of EM radiation, we evolved to use the EM radiation to see, and what we perceive to be light, is no more than seeing in the dark, and the light is an illusion, generated by sight. EM radiation has no mechanism to produce light, it is our eyes , that are the mechanism for the energy conversion.