Why Didn't We Think Of It?

...why didn't I think of this idea?

...I never thought that this can even be done...

...I should have thought of this idea...

When we start to have this feeling or thought, other than the consequential effect of experience, we lack selective randomness, observational consumption, and combinatory thinking.

By randomness alone, you become a wanderer.

By observation alone, you become a window-shopper.

By combinatory thinking and execution from the selected randomness and observation that you have consumed, you become a creator.