User talk:Chiswick ChapFrom Wikipedia, the free encyclopedia 2011 - 2012 - 2013 - 2014 - 2015 - 2016 - 2017 - 2018 - 2019 - 2020 - 2021 - 2022 - 2023 - 2024 - Mathematics and art: the Fraser spiral illusion (made of concentric circles) says something about visual perception, and is a forerunner of Op art. Archives
2011 - 2012 - 2013 - 2014 - 2015 - 2016 - 2017 - 2018 - 2019 - 2020 - 2021 - 2022 - 2023 - 2024 - Mathematics and art: the Fraser spiral illusion (made of concentric circles) says something about visual perception, and is a forerunner of Op art. Archives