[HumanoidLookingRobot]

Originally Posted by just_me

As objects become more distant, they appear smaller, because their angular diameter (visual angle) decreases. Your view on the world could be thought as an onion where each little layer represents a distance from the eye. As the distance gets larger, the surface area of that layer of onion becomes larger and larger. Because you see things in angles, the angle seen of an object would decrease because the object would take up a smaller amount of surface area at the larger distance. Subsequently, objects that are farther away would seem smaller.

Originally Posted by timsdd

maybe the bottles are like as big as a refrigerator!

I like tim's explanation better.