Final answer:
The Square of Opposition is a logical diagram displaying relationships between categorical propositions with lines indicating direct relationships among them, unlike lines in art which create visual experiences.
Step-by-step explanation:
The Square of Opposition is a diagram representing the different logical relationships between particular categorical propositions. When each of the propositions (universal affirmative, universal negative, particular affirmative, and particular negative) are placed at the four corners of a square, they exhibit specific relationships such as contradiction, contrariety, subcontrariety, and subalternation.
The lines connecting these corners indicate these relationships. A direct relationship would be represented as a straight line connecting two propositions that implies if one is true, the other is also true, such as in subalternation. This is in contrast to visual representations in art where lines, such as those described in works like Blue Cross with Red or Deep Magenta Square, are used to create a perceptual experience rather than to denote logical relationships.