  To help understand the centre dominance picture of confinement, we look at
Wilson loop distributions in pure SU(2) lattice gauge theory. A strong coupling
approximation for the distribution is developed to use for comparisons. We
perform a Fourier expansion of the distribution: centre dominance here
corresponds to suppression of odd terms beyond the first. The Fourier terms
correspond to SU(2) representations; hence Casimir scaling behaviour leads to
centre dominance. We examine the positive plaquette model, where only thick
vortices are present. We show that a simple picture of random, non-interacting
centre vortices gives a string tension about 3/4 of the measured value.
Finally, we attempt to limit confusion about the adjoint representation.
