WHEN TWO OR MORE ITEMS ARE PLACED TOGETHER, WE IMMEDIATELY COMPARE THEM.
WE DECIDE WHICH IS LARGER THAN THE OTHER.
A PERSPECTIVE WILL SHOW AN ITEM SEEMING TO BECOME SMALLER IF IT IS FURTHER AWAY FROM YOU.
WE COMPARE THE HEIGHTS OF BUILDINGS WHEN VIEWING A CITY HORIZON.
WHEN WE COMPARE DIFFERENT OBJECTS WE LOOK FOR SOMETHING WE KNOW. ITS SIZE WILL DETERMINE HOW WE PERCIEVE THE OTHER ITEMS.