The Weekly Photo Challenge from the folks on The Daily Post at http://dailypost.wordpress.com/2013/09/20/lines-patterns/ is From Lines To Patterns.
My first choice for this particular challenge was a shot of the inside of the Illinois State Building, now known as the James R Thompson Center, in Chicago.
A familiar sight in Chicago is the Pritzker Pavilion in Millennium Park.
Inside the massive structure that encloses the old Union Station in St Louis.
A view of the Chicago Botanic Garden seen through a trellis in the Fruit & Vegetable Garden.