Continuance is when your eyes are led in a particular direction.
Figure/Ground is when there is a stark contrast between the object and the background so it is easily identifiable as to what is figure ground and what is background.
Similarity is when two or more of the same or similar objects are shown.
Closure is when you are able to perceive a whole or complete the object without having all the parts given.
Proximity is when your eyes form groups of similar objects due to how close they are to each other.