Picture Object

Each backend provides an object named Picture that provides easy access to constructors. Constructors are algebra methods that produce a Picture but don't have any `` parameter. For example, all the methods on the Shape algebra are constructors.

The Picture object allows us to write

Picture.circle(100)

to call the circle method on Shape instead of the more verbose

circle[Algebra, Drawing](100)

So to call the circle method on Shape you'll usually just write

Picture.circle(100)

There is a subtle difference between the result of calling circle on the Picture object and same method on the Shape algebra. The former returns a Picture while the later returns a Drawing.

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