Polka Dot Warning Published on July 23, 2018 in Advantages and Disadvantages of POLCAFull resolution (1832 × 1244) Polka Dot Warning Polka dot pattern with exclamation marks as an illustration for a critical article on POLCA. This work by Christoph Roser at AllAboutLean.com is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Please credit the image as shown below. For digital documents and web pages please do include the links as shown below. Thank you.By Christoph Roser at AllAboutLean.com under the free CC-BY-SA 4.0 license.