In a room with a central pillar, Quinton is standing on one side of the pillar, while Janelle is on the exact opposite side. Without either of them moving, can Quinton see Janelle, and why or why not?

Provide a very brief response.
Quinton cannot see Janelle because the central pillar blocks his line of sight. Objects like a pillar create a visual barrier, so unless the pillar is transparent or has a reflective surface to bend or reflect the light coming from Janelle's direction to Quinton's eyes, Quinton will not be able to see around it. Visual line of sight requires an unobstructed path between the observer and the object of observation. Since the pillar is in the way, it prevents Quinton from directly seeing Janelle.