These are the designs I created that displayed a focal point by either concentration or isolation using only white and black media.
This is my design for concentration. This is a spiral design which is cropped but you can clearly see that it is leading you to a certain point in the image. This is the focal point of the design.
This is my design for isolation. These are tattoo like designs that are only outlined except one that is filled with black, making that the isolated design. Our attention is drawn towards it the minute we see the image.