Great post again. Wonderful analogy.
When I have an "idea", I like to start putting it into practice by finding a "rocK", a base I can build my idea upon. Something I "know" I can trust to be stable, known and dependable. A sure footing that I do not have to be concerned about while I build & develop my idea / project.
It is a good habit to have I think as it creates a type of 'safety net' position to springboard off.
The 'rock' I'm referring to could be a place (solid ground) or could be a fact I am certain of (truth) or it could be a skill (woodwork). Just something that is "solid" and can be used as a base to build upon. ie a "rock".