Pure Circuit Cap, by Rodney Shelden Fehsenfeld, is a free art nouveau display font with long, tapering curves and clipped, almost calligraphic joins. The letters feel theatrical and slightly electric: broad rounded forms sit beside needle-like points, while the rhythm of the caps gives the alphabet a poster-era elegance rather than a plain geometric look.
It fits best where lettering can carry the mood - on music posters, boutique packaging, magazine cover lines, title cards, and monograms - because the free font turns short words into ornament without losing its period flair. Use it when you want a headline to feel stylized and dramatic, not neutral.