Brown textured background. Remixed by rawpixel. https://www.rawpixel.com/image/11765148/brown-textured-background-remixed-rawpixelView licenseRoad Level (ca.1938) by Ethel Dougan. Original from The National Gallery of Art. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3370546/free-illustration-image-antique-art-artworkFree Image from public domain licensePlane for Leveling Wood (ca.1936) by Lena Nastasi. Original from The National Gallery of Art. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3387411/free-illustration-image-antique-art-artworkFree Image from public domain licenseOrange paper textured background. Remixed by rawpixel. https://www.rawpixel.com/image/11544936/image-background-paper-textureView licenseSection of the Thames embankment in 1867: the position of the low-level sewer is shown. Wood engraving. https://www.rawpixel.com/image/14013080/image-person-art-skyFree Image from public domain license