Explosion Flat by Vladimir Nikolic is a free inline geometric caps display font with a crisp Art Deco pulse. The letters pair broad, blocky outer shapes with narrow inner bands, so the font feels architectural and poster-minded rather than merely ornamental.
It sits naturally in packaging, event posters, music cover lines, title cards, and bold monograms, where the double-line treatment gives short wording a built-in sense of rhythm. As a free font, it makes most sense when you want a few words to carry the layout - especially headings and initials that can use those round O forms and sharp diagonals to frame a composition.