礎

1. Origins, structure, and basic meaning

• Structure: 礎 (いしずえ) is a noun used figuratively for the foundation supporting an activity or institution.
• Basic usage: 信頼が協力の礎となる assigns trust the role of foundation, whereas 技術が産業の礎を築く presents skill as what establishes an industrial base.

2. Common pitfalls and similar expressions

• Two predicates, two perspectives
  • 礎となる says that the subject becomes a foundation, while 礎を築く says that a foundation is established. The two perspectives should not be conflated.