ductility: the malleability of something that can be drawn into threads or wires or hammered into thin sheets
malleability: the property of being physically malleable; the property of something that can be worked or hammered or shaped without breaking
physiological nystagmus: small involuntary tremors of the eyeballs; when it is eliminated by stabilizing the image on the retina, visual perception fades rapidly from fatigue of the retinal receptors