Visual space can be accessed by introspection, by interrogation, or by suitable experimental procedures which allow relative location as well as some structural properties to be assessed, even quantitatively.

One can freely move in space but not in time.

walk_run_earth_sky
laura p krasnow walk_run_earth_sky Digital Photography
aView
2011
Digital Photography
20" x 26"

The walk was long, and I was tired. I stopped to rest…to lie down in the grass. The world abruptly changed. My perspective of the reality of the physical world broadened in scope, with the barely visible becoming an evocative reality.
laura p krasnow walk_run_earth_sky Digital Photography
aFog
2011
Digital Photography
16.5" x 22"

I woke up to a morning of fog...a thick mist obscuring the glow of autumn. I knew that underneath the haze, the world was radiant.

laura p krasnow walk_run_earth_sky Digital Photography
Presentiment
2012
Digital Photography
56" x 18.5"

A feeling that something will happen; intuition; foreboding; fear; sense, hunch, premonition; interim...between sleep and awake.

laura p krasnow walk_run_earth_sky Polaroid, Digital Photography
Assemblage1
2011
Polaroid, Digital Photography
52" x 22"

laura p krasnow walk_run_earth_sky Polaroid, Digital Photography
Assemblage2
2011
Polaroid, Digital Photography
92" x 29"
laura p krasnow walk_run_earth_sky Digital Photography
HereThere1
2012
Digital Photography
44" x 16.5"

In physics, a wave is a disturbance or oscillation that travels through space and matter, accompanied by a transfer of energy. Wave motion transfers energy from one point to another, often with no permanent displacement of the particles of the medium. They consist of oscillations or vibrations around almost fixed locations. Waves are described by a wave equation which sets out how the disturbance proceeds over time.

laura p krasnow walk_run_earth_sky Digital Photography
HereThere2
2012
Digital Photography
44" x 16.5"

In physics, spacetime (also space–time, space time or space–time continuum) is any mathematical model that combines space and time into a single interwoven continuum. Time cannot be separated from the three dimensions of space, because the observed rate at which time passes for an object depends on the object's velocity relative to the observer and also on the strength of gravitational fields, which can slow the passage of time for an object as seen by an observer outside the field.