> some impalpable material "impalpable" means you can't touch it. Like a low pressure gas? Neon lighting fits this. "brightly glowing, electrified glass tubes

> some impalpable material "impalpable" means you can't touch it. Like a low pressure gas? Neon lighting fits this. "brightly glowing, electrified glass tubes or bulbs that contain rarefied neon or other gases" And "It was discovered in 1898" https://en.wikipedia.org/wiki/Neon_lighting https://en.wikipedia.org/wiki/Neon_lighting