[Doctor Stochastic]

Space and time are not quantized in most representations of quantum mechanics. A free particle may occupy any spatial position. A constrained particle may have quantized positions.

[Socratic]

"Space and time are not quantized in most representations of quantum mechanics. A free particle may occupy any spatial position. A constrained particle may have quantized positions."

Could it not be that he is saying that common notions of contraint are not valid because it relies upon a notion of "pointness" or, by extention, definite boundaries? Perhaps certain spatial positions, even in a macroscopic world, would not be valid?