With all the attention that the Denver Art Museum’s new Libeskind-designed Frederic Hamilton building has received lately, now is a good time to look back and remember that the Gio Ponti-designed existing art museum building was once itself an architecturally-bold proposal. The Ponti building, a 28-sided, 7-story structure clad in over one million hand-laid gray tiles, opened in 1971. Here’s a rendering from a promotional publication called “Metropolitan Denver” published in 1966 by the Junior League of Denver: