When completing a puzzle, at first it is fast. You just connect up all the parts that form the border, because those pieces stand out. Then you go for the big spots of color, or something unique, and fill those in reasonably quickly. Then you find yourself in the doldrums... slogging along trying to connect everything up. But then past a certain (tipping) point, you complete the puzzle really quickly because you've solved some of the ornery parts, and now you see the shape. And, now there are noticeably fewer pieces to fit together.
When completing a puzzle, at first it is fast. You just connect up all the parts that form the border, because those pieces stand out. Then you go for the big spots of color, or something unique, and fill those in reasonably quickly. Then you find yourself in the doldrums... slogging along trying to connect everything up. But then past a certain (tipping) point, you complete the puzzle really quickly because you've solved some of the ornery parts, and now you see the shape. And, now there are noticeably fewer pieces to fit together.
Just a short story about puzzles. No reason. :)