The majority of land slugs are simultaneous hermaphrodites, meaning they possess both male and female reproductive organs that are functional at the same time.
Chemical coatings can also be combined onto a single coating, allowing for a crackle tube to have multiple simultaneous filaments of several different colors.
Chords are the simultaneous soundings of notes; whereas harmonic, vertical features are considered secondary and almost incidental when counterpoint is the predominant textural element.
