When objects stand out from one another, different luminance or colour is used – referred to as contrast. Colour, form and space are three different elements used to help achieve contrast.
Colour helps make an object distinguishable, such as when opposite colours like black and white are used for throw pillows. Combining two or more forms (such as a round mirror over a rectangular table) create contrast be distributing the attention between both items. Space can also be utilized to achieve contrast by efficiently dividing an area into usable positive and negative spaces.