These bridges and this arch began with an idea.

Idea definition

i·de·a [īˈdēə] NOUN - Bing

1. a thought or suggestion as to a possible course of action:

ORIGIN

late Middle English (sense 3): via Latin from Greek idea ‘form, pattern,’ from the base of idein ‘to see.’

Synonym Discussion of idea – Merriam Webster

idea, concept, conception, thought, notion, impression mean what exists in the mind as a representation (as of something comprehended) or as a formulation (as of a plan). idea may apply to a mental image or formulation of something seen or known or imagined, to a pure abstraction, or to something assumed or vaguely sensed.

Medical Dictionary

Idea noun \ ī-ˈdē-ə , ˈīd-(ˌ)ē-ə \

1 :an entity (as a thought, concept, sensation, or image) actually or potentially present to consciousness    2 :a formulated thought or opinion

The bridges we understand, the arch not so much, except in our spirit. Saying things such as “spirit” moves us into the unseen realm, until we stand in the presence of that arch. The sense, the sensation of that arch gives us Wonder; would we build it if we could? Most certainly, but we cannot – so we build bridges. The principles, or the ideas of our bridges are contained in the structure of that arch. The idea started when someone saw two points that they to connect, and considered the possibility of building their own arch. Initially an unseen reality, the reality of the idea became substance.

Faith is a cognitive process, an awareness of the reality of what is unseen.