The secret to the screens is in what's behind them: a thin strip of metal-coated plastic that's only 50 microns thick -- about half the width of a human hair -- and wraps around a spool.
Since joining the Test side just 15 months ago, he has taken 89 wickets at 17.13 from his first 16 games through the simple tactic of landing the ball on a perfect line and length and consistently moving it half the width of the bat in either direction.
However, the eyes of a winghead shark (Eusphyra blochii), which Dr McComb describes as a 'swimming boomerang' because its head width is almost half its body length, overlap by 48 degrees.
While a single, bed-width cushion creates an orderly line, a pair of bolsters one for each half of the bed makes more sense for bedmates with opposing propping needs.