-Any graphical object can be printed over a white backgound to
-mask parts of objects that lie beneath. This can be useful to
-improve the appearance of collisions in complex situations when
-repositioning objects is impractical. It is necessary to explicitly
-set the @code{layer} property to control which objects are masked
-by the white background.
+Any graphical object can be printed over a white background to mask
+parts of objects that lie beneath. This can be useful to improve the
+appearance of collisions in complex situations when repositioning
+objects is impractical. It is necessary to explicitly set the
+@code{layer} property to control which objects are masked by the white
+background.