The sphere is suspended from three eyebolts mounted directly in the ceiling by
the site. Three suspension wires allow the sphere to find its own stable plane.
The angle of the suspension wires should be in the range of 15 to 20 degrees
(we recommend 20 degrees). If the angle of the suspension lines from the sphere
to the ceiling is too acute, the sphere can be susceptible to vertical
instability (bouncing). Too steep an angle can make the sphere susceptible to
pendulum instability (swaying).
The basic approach is to layout the footprint for the SOS exhibit. The
projectors are at the corners of a square, with the sphere positioned in the
exact center of that square (see the floorplan diagram for
reference). Conceptually, it is easiest to think of the sphere hanging from
three points, which are at the corners of an equilateral triangle of some size.
The size of the triangle is determined by the angles of the cables coming out
of the sphere and the height of the ceiling. Low ceilings require smaller
triangles, while high ceilings require larger triangles. The triangle points
need to all be on the same plane and that plane needs to be parallel to the
floor in order to have sphere hang where you expect it too.
One of the more difficult dimensions to come up with is the length of the sides
of the triangle. To simplify the process of determining this length, use either
the Sphere Mount Triangle Calculator below or download the provided Microsoft
Simply input the ceiling height and it will output the parameters needed to
create the triangle.