Polarized Light Microscopy (PLM) is really cool method that reveals ordered structures within microstructures like nylon fibers, mineral grains, and wet soap. [For gearheads wanting to learn more, check out the interactive (Flash and Java) Tutorials at Florida State's Microscopy University and the separate primer on using PLM to study cystals: Birefringent Crystals].
Fran Rosevear (1912-2010) was a Procter & Gamble phase chemist and microscopist who authored seminal papers of PLM for characterizing surfactants (soap) as they hydrate (get wet). The tentacle like structures in the "Neat" phase are bilayer tubes (see images). If you watch water enter dry soap, you can witness these structures form; Rosevear called the analogous, equilibrated structure "oily streaks".
|Ref-2 Oily Streaks|