124 slide:ology
Next, determine the source of your lighting. The source will dictate how light is cast on your
background. Determining how light affects your background also influences how light is cast
on the objects placed on the background. Light creates shadows and highlights.
Determining the Light Source
These eight back-
grounds have a
light source that
shines across them.
When you place
elements into these
backgrounds, their
highlights and
shadows follow
the same source of
light. For your back-
ground, select one
angle for the light
source and stick
with it throughout
the presentation.
Using Visual Elements: Background, Color, and Text 125
Adding a soft, circular shadow
behind the sphere makes it
look as if it is hovering over
a surface or in front of a
wall, and that you’re looking
straight at it.
T!P
• The background is a surface, stage,
or backdrop—not the main focus.
• What’s in the background should be
subordinate to the real content.
• Avoid adding photos or images to the
background. It distracts the audience;
they will try to process what the image
is and why it has been obscured.
An elliptical shadow placed
at the bottom of the sphere
makes it look as if it’s sitting
on a surface.
Adding a reflection below the
sphere makes it look as if it’s
sitting on a very shiny surface.
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