  The Hubble classification scheme of galaxies is based on blue-light
appearance. Atlases reveal the rich variety of responses of the Population I
component (`the mask') of gas and dust to the underlying, older, stellar
population. However, the Population I component may only constitute 5 percent
of the dynamical mass of the galaxy; furthermore, dusty masks are highly
effective in hiding bars. We firstly discuss the rich duality in spiral
structure, and highlight a near-infrared classification scheme for spiral
galaxies. We next show that images secured with SALTICAM will be ideally suited
to probe key questions such as whether the optical light in the gaseous
Population I component is the result of Kolmogorov turbulence, cascasding from
the largest of scales down to the Nyquist limit. If so, the optical emission in
galaxies will be organized in a global fractal pattern with an intrinsic 1D
power spectrum having a slope of -5/3, or -8/3 in 2D.
