Polymers, colloids, surfactants, and liquid crystals.
The observer tries to swim through a polymer solution and finds it strange. If they push slowly, it flows like honey (viscous); but if they jab it quickly, it snaps back like a rubber band (elastic). This "viscoelastic" behavior is what makes your shampoo or bubble gum behave the way they do. soft matter physics masao doi pdf
Soft matter refers to a diverse class of materials—including —that are easily deformed by external forces. These materials are characterized by: Polymers, colloids, surfactants, and liquid crystals