The view from my living room window consists of buildings, trees, roads and cars.  As a result, I see many straight and curved lines.  Squares, circles, rectangles, and even triangles are within my view.

The giant tree in front combines both straight lines and curved.  The cars contain both straight and curved lines as well, and have rectangular shapes.  The wheels serve as the circles I see.  Roads appear at an angle which look like triangles.  The buildings hold straight lines and are shaped like squares, rectangles, cubes, and rectangular prisms, depending on the angle you look at it at.