If you don't want to paint the wall, buy a sheep wall decal, such as the **Baa** **Baa** Black Sheep Wall Decal from Rosenberry Rooms.

**Baa**, **Baa**, Black Sheep would also make a sweet nursery theme for either gender.

The ratio of the distances ab and ac is constant, and the angle **baa** E a is constant for all positions of the FIG H

Mechanism; so that, if b is guided in any curve, the point a will describe a similar curve turned through an angle **baa**, the scales of the curves being in the ratio ab to cc. Sylvester called an instrument based on this property aplagiograph or a skew pantograph.