  Skill mastery is a priority for success in all fields. We present a parallel
between the development of skill mastery and the process of solving jigsaw
puzzles. We show that iterative random sampling solves jigsaw puzzles in two
phases: a lag phase that is characterized by little change and occupies the
majority of the time, and a growth phase that marks rapid and imminent puzzle
completion. Changes in the proportions of the number of single pieces and
larger pieces can be overlaid on the timeline and progression of skill mastery.
An emphasis is placed on the development of connections between pieces, which
serves as an indicator of increasing puzzle completion and increasing skill
mastery. Our manuscript provides a straightforward visual of skill mastery in
the context of a common recreational activity.
