So a play group recently had a dispute on what are valid placements for spells like Wall of Force and Wall of Ice. We are aware you can't cut through creatures or objects, but there was some hangup on what an "unbroken open space" is. Are you able to place to flat walls on edges, or can they only be placed through the middle of actual grid spaces regardless of the wall's width?
The main concern is: are you able to "divide" a battlefield between two adjacent non-diagonal creatures using wall of force, or is that functionality only for Wall of Stone? What about dividing creatures in the diagonal direction?
Specifically, which configurations are valid in the image below:
https://imgur.com/a/Upvht8Z
No matter how I interpret it, it appears to be legal to separate creatures diagonally, but horizontally is where it gets iffy. Currently, the two interpretations of "unbroken open space" I've identified are the general one (do I have space for this TV) or open grid spaces.