Source unknown, found via Mark D. Sikes | Checkered floors, Flooring, Patio tiles
LEEVAN Black and White Checkered Area Rug 5x7 ft Machine Washable Retro Checkerboard Indoor Outdoor Rug Extra Large Patio Rugs Woven Cotton Plaid Floor Carpet for Living Room/Balcony/Backyard : Amazon.co.uk: Home &