At the end of 2012, Swiss photographer Gus Petro traveled to the United States. On his trip he visited the Grand Canyon in Arizona. 277 miles (446 km) long, up to 18 miles (29 km) wide and over 6,000 ft (1,800 m) deep, it is considered one of the Seven Natural Wonders of the World.

In a series entitled Empty, Petro captured the vastness of the mighty canyon.

 

 

From the emptiness of the Grand Canyon, Petro then journeyed north to the metropolis of New York City. There he captured the density of a major urban center in the aptly titled series, Dense.

 

 

The contrast of the two locations struck Petro, and he wondered what it would look like if he combined the opposite forces. In a final series entitled Merge, Petro brought together the feelings of emptiness and density he experienced on his trip.