1.)Closure- When our eyes see incomplete objects then our eyes tend to fill in the gaps which are not present because we want to see the whole object rather than fragments of the whole.
Example: When seen, these horizontal lines to us will be thought of as a whole bunny rather then many lines with different lengths and gaps cause our mind closes gaps.

http://i0.wp.com/lemasney.com/consulting/wp-content/uploads/2014/01/15-of-365-Closure-design-principle.png

 2.)Continuity- We perceive patterns which are continuous and smooth  and try to avoid seeing discontinuous patterns. This means that patterns that have a order and that flow will catch our eyes but patterns that break apart or have some sort of disturbance will not catch our eyes.
Example: In the patterns below, we see a smooth pattern with 1st branch being continuous to top and bottom branch which allows us not to break the pattern into two wholes and be discontinuous since we  like to see continuous patterns.

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQIxKAqtMNE68NJIfXLIVbqiSFEo-A4_TbS_ovjJapYpRRZMCMtL115YkD2zlZocSRVcAP4GfXXdcKHvyEfBFnvKPSkhuefcUMva_1ChxNx1cm6RXG1ugKgkXxH0atKETOjIi_mw8QVoXv/s200/continuity.jpg

3.)Similarity- when we see a mix of shapes or any objects, our mind groups similar objects together and not link a group of not similar objects together.

Example: In both these images we will group the similar objects of four apples and four pears but we will not group in such that every group consists of 2 apples and 2 pears because we like to group similar objects.

http://www.mhhe.com/socscience/intro/ibank/ibank/0055.jpg

4.)Proximity- Our brain likes to group object that are close together in distance.
Example: In this image, our brains will group these squares as rows rather than columns because the rows are close to each other while the columns are spread apart in distance. 

http://boxesandarrows.com/files/banda/cognitive_psychology_ia_from_theory_to_practice/withrow_img2.gif

5.)Figure-ground perception- this basically means that when we see an object, we find the ground giving us the base of the picture but sometimes a different picture when we focus on a different ground.
Example: In this image, we can either focus on the black as our background and see a jazz player or focus on the white and see a lady which depends which background you choose to focus on.


http://www.appsychology.com/Book/Biological/Peceptionpics/sax-wom.gif