The standard Science On a Sphere® set up includes 4 projectors in a square
around a 68" carbon fiber sphere. For sites that don’t have enough space for
the standard configuration, there are many options available:
The four projectors are placed at the four corners of a square that is
25.5–28.5 feet (7.8–8.7 meters) on each side, depending on your projector. The
Sphere is hung at the center of the square with a guard rail to prevent viewers
from reaching the Sphere. Projectors can be mounted to the ceiling or on the
floor. Floor-mounted projectors should be isolated from viewers with a
protective wall (a "kick"). Projectors, whether floor-mounted or
ceiling-mounted, require a stable mounting surface, such as a concrete slab.
The SOS computers can be located up to 200 feet (60 meters) away from the
sphere with the use of additional video cable boosters. The computers must be
in a clean, well-ventilated area.
If you don’t have room for four projectors, then using fewer projectors is a
great option. The projectors remain 90 degrees apart from one another and one
or two quadrants of the sphere are dark, depending on how many projectors are
used. Some sites have opted to put the sphere in a corner or against a wall to
help hide the dark areas.
When using only three projectors, each projector is placed at each of the
corners of an isosceles right triangle, with the Sphere placed at the center
of the triangle's hypotenuse so that it is equidistant from all three
projectors. The hypotenuse of the triangle should be 37–41 feet (11.3–12.5
meters) long, and the other two sides should both be 25.5–28.5 feet (7.8–8.7
meters) long, depending on your projector. In this configuration you'll have a
viewing angle for the Sphere of 146°, past which the dark areas will become
When using only two projectors, each projector is placed at two corners of a
rectangle. The rectangle should be 25.5–28.5 feet (7.8–8.7 meters) by 17.5–19
feet, depending on your projector. The projectors will be placed on the two
corners of one of the long sides of the rectangle, with the Sphere hung at the
midpoint of the opposite long side. In this configuration you'll have a viewing
angle for the Sphere of 65°, past which the dark areas will become visible.