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My kid was very perfect in color sorting from the age 1-2 . Your concept is really great for so many kids even for preschoolers also. I am going to design some activity based on your post for my school students

Nice! Thats good to hear! I'm glad your kid was doing great so early! Its much easier...I think. On the future. When learning comes easily I mean, its also more easy for us.

I know that these can be used to preschoolers. Age is not really something to consider. It depends more on the kids and their abilities.