Anti-Eraser sources:

https://justdealsstore.com/i5/asr/e6b2e1d9-ae0e-438c-88df-5f21e68f7892_1.b0a73c366dc978d7f9cc14e140565420.jpeg?odnWidth=144&odnHeight=144&odnBg=ffffff
https://moorecoinc.com/app/uploads/2016/06/framed-glass-whiteboard-4x6-front-no-props-white.jpg
https://pixabay.com/photos/backdrop-block-brick-building-21534/
https://pixabay.com/photos/giraffe-animals-zoo-funny-fauna-901009/
https://pixabay.com/illustrations/cartoon-doodle-sketch-kids-people-1082003/
https://pixabay.com/illustrations/happy-new-year-new-year-s-day-1063797/
https://pixabay.com/photos/graffiti-chalkboard-blackboard-love-2227941/
https://pixabay.com/illustrations/geometry-mathematics-volume-surface-1044090/
https://pixabay.com/photos/fruit-pear-pear-basket-sweet-bio-1534494/
https://pixabay.com/photos/board-business-company-creative-2449726/
https://pixabay.com/photos/math-blackboard-education-classroom-1547018/
https://pixabay.com/photos/gesture-thumbs-up-good-fingers-772977/