To think outside the box means to think freely, but in this context Philip suggests thinking while being bound by old structures, rules, or practices.
Context: "I think we should be bound by old, nonfunctional, or limiting structures, rules, or practices - Philip said and the others just stared at him." Claim: "I think we should think outside the box - Philip said and the others just stared at him."
Considering the context, is the claim true, false, or unknown?