--- navhome: /docs sort: 2 --- # Limbs and wings One feature Hoon lacks: a context that isn't a first-class value. Hoon has no concept of scope, environment, etc. A twig has one data source, the *subject*, a noun like any other. In most languages "variable" and "attribute" are different things. They are both symbols, but a variable is in "the environment" and a attribute is on "an object." In Hoon, "the environment" is "an object" -- the subject. `$limb` and `$wing` are two basic twig stems that extract information from the subject. A `limb` is an attribute; a `wing` is an attribute path, ie, a list of limbs. ## Stems