Close-up view of an NE-2 (5mm diameter) type neon lamp. Both electrodes appear to glow simultaneously due to being powered by 60Hz alternating current, with the exposure time being longer than a full current cycle.
<a href="//commons.wikimedia.org/wiki/User:Junkyardsparkle" title="User:Junkyardsparkle">Junkyardsparkle</a>
<span class="int-own-work" lang="en">Own work</span>