The Principle of Contingent Causation: The Impossibility of Infinite Regress.

[emjay]

Unless you can conceive of how something is logically possible, I don't think you've truly conceived of it in any logically meaningful sense.

Not necessarily. People conceived of airplanes centuries ago, without knowing how to make them. And still, no one can deny that it's thanks to their wild dreams and ambitions that we have airplanes today.

But the conception in and of itself doesn't speak to the logical feasibility of an idea. Ie some ideas may turn out to be logically feasible, others may not, but the actual initial conception doesn't in and of itself speak to that feasibility, unless it directly addresses that feasibility. Ie for instance the difference between a designer who conceives not only of the thing as a whole but also how it works is addressing the logical feasibility, but a child idly imagining something is not addressing that feasibility at all.