Nature's Light These pictures have things in common with each other.We have the Northern Lights a natural aurora the are several places over the world that you can see this amazing lighting display where the inert (noble) gases in the atomsphere are excited by an electric field, Then there is the Neon Sign which has Neon & Argon gas at a low pressure trap in a glass tube & illuminated by electricity.The Birds? are a light display that can be made with, Argon, Helium, Krypton, Neon & Xenon used in glass vessels to create a plasma display of many light forms by the artist using different pressures of 2 or more of the gases within the vessel. & Lightning where the electical charge has illuminated the inert gases