From Wall of Force:
The caster can form the wall into a flat, vertical plane whose area is up to one 10-foot square per level. The wall must be continuous and unbroken when formed. If its surface is broken by any object or creature, the spell fails.
Does this allow or disallow making a shape (such as a square or rectangle) relative to looking down? For example, could a (typical) large creature be surrounded by four 10x10ft squares of this spell in a single cast?