Chefs who cook without recipes go on instinct, knowing when to add a pinch of ‘this’, or a pinch of ‘that’. If a newbie cook were learning from them, they’d ask: “how much is a pinch”? Almost always, the answer would be: “it’s just the right amount, and you’ll know if it is too much. Like the kid who gets his pudgy cheeks pinched by his scary Aunt Betty, too much is too much.
Photographers cook with light. As you get better and better at it, you start realizing when and where you need a pinch of light to set your image apart from everything else out there. Often, an umbrella or soft box over your light source will add too much light. Like the kid with the pinched cheeks, you’ll get all irritated and run screaming into the other room.