People hold up protest signs at the Women's March in Boston. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3337488/free-photo-image-protest-accessory-advertisementFree Image from public domain licenseSkeleton and écorché figure holding placard featuring male and female figures: half-title page to 'Trattato di anatomia… https://www.rawpixel.com/image/13989896/image-cartoon-face-personFree Image from public domain licenseThe piazza outside St Paul's church, Covent Garden, London, full of people selling their wares: a man is holding a placard… https://www.rawpixel.com/image/13977345/image-cartoon-face-personFree Image from public domain license