This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Opticalillusioncheckerboardtwistedcord.svg Optical illusion All edges in the image are straight and either horizontal vertical or at angle but may appear otherwise SVG file created by me from scratch in text editor declared to be PD AnonMoos Distorting illusions
Page 2023 Free-images.com. All images are Public Domain