  A geometrical description of three qubit entanglement is given. A part of the
transformations corresponding to stochastic local operations and classical
communication on the qubits is regarded as a gauge degree of freedom. Entangled
states can be represented by the points of the Klein quadric ${\cal Q}$ a space
known from twistor theory. It is shown that three-qubit invariants are
vanishing on special subspaces of ${\cal Q}$. An invariant vanishing for the
$GHZ$ class is proposed. A geometric interpretation of the canonical
decomposition and the inequality for distributed entanglement is also given.
