Point Of View: Length:

When we travel within a space ship, despite of its speed, everything emerges normal as long as our ship is not accelerating. We can cruise all along at 99.9 % of the speed of light associative to the Earth, though if we are in the interior of the space ship, then ship is forever stationary relative to us. The time, space, and mass emerge normal from the point of view of passengers on a relativistic space journey. Though, as we observe the space ship sail by from the vantage point of the Earth, its length reduces as its speed rises. Its diameter is not influenced. The extent to which this occurs is similar as the level to which the time slows down.

Assume L be the apparent length of the moving ship as the fraction of its length whenever it is standing still relative to a spectator. Assume u be the speed of the ship as a fraction of the speed of light. Then,

L = (1 - u²)^1/2

This outcome is shown in figure below for different relative forward speeds. The foreshortening occurs wholly in the direction of motion. This generates apparent physical deformation of the ship and everything inside, involving the passengers. It is kind of like those mirrors in fun houses which are concave in only one dimension and reflect your image "all scrunched up." Because the speed of the ship shifts towards the speed of light, it's observed length move towards zero.

Figure: Since an object moves faster and faster, it grows shorter and shorter all along the axis of its motion.