The ramp descends physically and symbolically to allow views of the vast forage areas, the marshlands and a reverse-periscope underwater image of the pond. At each stage along the ramp, interpretive displays augment the views; similarly, the exhibits complement interpretive trails which lace the refuge."
A ramp descends both literally and figuratively, offering vistas of vast pastures, marshes, and an underwater view of a pond via a reverse-periscope.  At each point along the ramp, informative displays enhance the views; similarly, exhibits complement interpretive trails that crisscross the refuge.