Question

what causes us to perceive objects in three dimensions?
objects in 3d appear to have width and height, but no depth.
light bouncing or reflecting off an object in different ways.
the curvature of space time relative to objects solar mass.
the rate of time dilation as we approach objects

Explanation:

Our perception of three - dimensional objects is mainly due to light bouncing or reflecting off an object in different ways. This provides visual cues like shading, texture gradients, and relative size differences that help our brain interpret depth. Objects in 3D have width, height, and depth. The curvature of space - time and time dilation are concepts related to general relativity and not directly related to our everyday perception of 3D objects.

Answer:

Light bouncing or reflecting off an object in different ways.