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I have mentioned on here that I am disabled, and basically home bound. So I don't get to go to the park or do "normal" out of house activities with my kids. So I am always looking for new fun stuff we can do at home.
My daughter (20 months old) brought some artwork home from daycare one day, and her school had created "goop" and the kids painted with it. I tried to re-create it with my 5 year old son, who had a blast getting his hands dirty and making goopy pictures. It has since become a hit in our house and is a great rainy (or not feeling well) day activity.