Batter's eye

If there are seats behind center field, they are painted a dark color and are not occupied during baseball games, as the "black bleachers" section is directly in front of them.

At Fenway Park in Boston, the batter's eye is made by laying a tarp over a section of the center field bleachers.

Ballparks in Minor League Baseball are normally much smaller than major-league parks, and the vast majority have no seats or other sections in the outfield that would distract batters or obstruct their view of the pitched ball.

[7] Other minor or independent league stadiums have erected tall, dark, stand-alone batters-eye screens in center to ensure there is no interference with the batter's view.

For example, beyond the batter's eye screen looming over center field in SIUH Community Park, home of the Staten Island FerryHawks, is Upper New York Bay.

Wrigley Field , before the 2005–2006 remodeling, with juniper-filled Batter's Eye section visible.
The old Yankee Stadium with batter's eye visible on upper right above the center field fence
The batter's eye at Comerica Park is covered in shrubbery and has a fountain on top of it.
Peoria Sports Complex , a spring training and minor-league ballpark in Arizona, has a blue batter's eye in center field.