Waves can be terminated with other components, yielding infinitely extensible spaceships and growing objects. A finite wave of this kind is a wick-like structure attached at both ends to moving spaceship-like patterns, in such a way that the entire pattern is mobile. If the wave gets longer over time, the supporting patterns are wavestretchers.
Also, the gliders or spaceships emitted by a rake may be referred to as a wave, again because the line as a whole appears to move in a different direction from the individual components, due to the rake's movement. Compare with stream.
In general a wave can be interpreted as moving at a variety of different velocities, depending on which specific subcomponents are chosen as the starting and ending points for calculating speed and direction. See antstretcher, wavestretcher for a practical example of identical wave ends being connected to spaceships with different velocities.