If you're Rh-negative and your baby is Rh-positive, your body will react to the baby's blood as a foreign substance. Your body will create antibodies (proteins) against the baby's Rh-positive blood. These antibodies usually don't cause problems during a first pregnancy.
One point perspective definition. One-point perspective is a type of linear perspective. All categories of linear perspective include a horizon line and a stationary point (the position of the observer). In one-point perspective, only one vanishing point exists; lines radiate outwardly from this point, and perpendicular lines meet at this point. One-point perspective is the same as parallel perspective.
Vanishing Point. One of the main uses of perspective in painting is to establish the position from which the artist or spectator views the scene. This is done by placing a horizontal line across the notional surface of the picture (the 'horizon line') and a vertical line down it (the 'centre of vision').