The refraction of light where the plastic bonds together creates the appearance of a line. Apple consumers are famously style-minded and will often make a purchase decision based on a computer's color rather than its storage capacity. They weren't here when the machine arrived and they are getting bigger. Apple insisted that it was impossible that cracks would show up for the first time or expand after the machine was purchased, but suggested the so-called mold lines were so faint that they might not be noticed initially. It's like complaining if wood has grains in it.
Wood does have grains in it, and it is still beautiful.
But the cracks appeared after the purchase, not before, which wouldn't correspond to slow sales. That means people aren't buying them, period. But other investors had felt confident, believing that Apple's new product line would boost sales. Over at the Raging Bull Apple boards , the mood was grim as investors watched the stock price plummet. Send it .