The impressive "I Know You Know That I Know" is a public commission granted to Denver artist Sandra Fettingis, who was asked by the Colorado Convention Center to cover an astounding 160 feet of wall space with murals. What she came up with is a highly sophisticated and complex set of triangular patterns that look something like trellises. These patterns — painted or in the form of cut acrylic panels — are essentially the same save for size and color (though all of them are black, white or red). The piece is meant to demonstrate how things change over time yet remain the same in some way — and it enlivens a corridor that had an unwelcome gloominess to it before.