Foucault pendulum greyscale background, vintage image. Remixed by rawpixel. https://www.rawpixel.com/image/9825717/image-background-art-vintageView licenseOil field worker applying grease to rotating drill pipe, Kilgore, Texas by Russell Lee https://www.rawpixel.com/image/12171030/image-person-art-vintageFree Image from public domain license