Drawing: “Archimedean Spirals Drawn by a 22-Year-Old Male Suffering from Unilateral Essential Tremor,” by Svenskbygderna, 1 May 2019, in Wikimedia Commons … https://commons.wikimedia.org/wiki/File:Spiral_drawing_of_Essential_Tremor_patient.svg … CC BY-SA 4.0 International … DESCRIPTION: “The spiral on the left was drawn by the subject using his left hand, and the one on the right with his right hand.”