Planck's Brick- Fundamental Space

I was just thinking about minimum space in the conceivably observable universe (using light). Initially, and momentarily, it felt like it would necessarily be a block; I pictured 1 Planck's length by one Planck' length. I then realized, however, that, in any given moment, if using light to consider that a space exists, light would be moving in one direction (Plank's length) but also oscillating perpendicularly to that direction. This feels like it would create what I am coining as a "Planck's Brick." Assuming the oscillating motion is entirely perpendicular, with respect to the same unit of light's motion, the area of space traveled/"claimed" by light in a small unit of time could be traced/outlined as more like a rectangle than a square. 

As light does not move in only one direction in our universe, this would result in the orientation of these bricks changing constantly, in my mind looking like a clockwork mechanism, with brick spaces ticking into their new orientations moment by moment. The number of these bricks in our universe would be finite though, expanding each moment as the universe expands. Perhaps, from another perspective, however (pocket dimensions included), the number of these brick spaces remains constant. 

Pulling back the veil, I was considering how many "arrows" one would need to fire to strike every point in reality and, in conceiving of these as points of light streaking through space, and then pausing the image, I realized that the oscillations would form this asymetrical shape on the smallest level. Based on an experience I had where my mind felt trapped in a box, this is a very hopeful revelation for me.