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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Panda Optical Illusion
I Surveyed 15 people about the panda image and all fifteen participants reported seeing atleast two pandas. All of the participants saw the two full-sized black and white pandas in the image and 13/15 participants recognized that there are more than the two obvious pandas in the image, wether they are in the rocks or in the bamboo. The questions were asked after seeing the image for only a minute and I would be curious if that after looking over the image longer if there would be a higher number of participants reporting 2+ pandas. Also, I did not present this image as an "optical illusion". I would suspect that all fifteen participants would have said they saw more than two pandas if I had presented the image as an illusion.