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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
The mammal in studying our senses
This is a picture of a cow, but hard to see because crucial edges are missing and many extraneous edges are shown; it's a terrible picture, but very useful for showing how much we emphasize edges in our processing of visual input. Some people find it easiest to see the cow if you look at the picture from some distance. If you still can't see the cow, it's a fun activity to show the picture to a bunch of friends or family members and very likely one of them will be able to see the cow and then show it to the rest of you.
Good luck!
Ingrid Waldron