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.
Ilusion optica. es Esta ilusion optica consiste en que quien la mira observara una mancha entre ciertas lineas devido su posicion desregularizada own Amaximiliano Jueves de enero del Optical illusions
Page 2023 Free-images.com. All images are Public Domain