[Tom Martinez]

Alicia,

An edge can be either sharp or soft. Losing an edge and finding it again is the principle that you're seeking. Let's assume that you are working on a form, any form, and the outer boundary of that form has a noticeable edge. As you follow that edge it enters into an area where the light is striking that form in a strong manner(highlighting it). The edge disappears (losing it) in the highlighted area. When that edge travels out of the strong light, it then becomes apparent again, thus it is found (a found edge). I hope that this helps.