Hair leaves the scalp at 15 to 25 degrees at the hairline and spirals in the crown. Copying those angles channel by channel separates a natural result from an obvious one.
A transplant looks natural when every channel copies the angle the hair used before it was lost, and hair does not leave the scalp vertically anywhere on the head. At the frontal hairline it emerges at fifteen to twenty-five degrees, lying almost flat and pointing forward; behind it the angle steepens towards thirty or forty; in the crown it spirals around a fixed centre. Those are the angles each channel has to reproduce, one by one, across the whole recipient area. Get it wrong and the hair grows out standing to attention, which reads as artificial long before anyone counts grafts.
A sapphire blade cuts a narrow V-shaped slit rather than a round hole, so direction is built into the channel and the graft can only seat one way. That makes angle and direction reproducible across thousands of channels instead of dependent on how each graft happens to land. The narrower wound also displaces less tissue per channel, which is what allows channels to sit closer together without starving the skin between them of blood supply.
Angle is how steeply the hair leaves the skin; direction is where it points once it does. At the temples hair points down and back, at the front it points forward, at a parting it splits, and in the crown it rotates around the whorl. We mark the whorl centre before shaving, because clipping the head erases it. A crown rebuilt without finding that original centre grows into a visible flat spot that no amount of added density will rescue.
Ask for a wet-hair photograph at month twelve, taken from above and from the side. Wet hair reveals direction because it clumps along its natural flow, while dry styled hair hides everything. Look at the temple points and the crown rather than the front row. If every published photograph is a front-facing dry shot with product in the hair, that is a choice, and it is usually made for a reason.
Only partly. Grafts can be removed and re-implanted at a better angle, but that spends donor grafts on repair rather than coverage. Angle is one of the few parts of this operation that is genuinely difficult to fix afterwards.
No. The blade makes a precise, narrow slit; the surgeon decides where it points. A sapphire tip in the wrong hands produces very neat channels pointing in the wrong direction.