@AndrewSteane writes in his textbook that a Pauli spinor is a flagpole - with length, direction, flag orientation - and a sign.
A Dirac spinor is a more complicated object. What is the most intuitive visualization of a Dirac spinor?
Update: Steane proposes two flagpoles.
The 8 parameters of a Dirac spinor are 1 magnitude, 3 flagpole angles, 3 boost parameters (such as vx vy vz), and 1 fraction specifying particle and antiparticle components.
Does it make sense to contract the latter 4 numbers into a second flagpole? How can one relate the two descriptions?