Cut out a number of circles from card stock, or paper glued to thin cardboard, like a cereal box.
We used a round lid for a guide.
Draw lines through the center of the circle to divide it into fourths, or eighths.
Color in the "pie" pieces in different colors. We used primary colors.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFRjWwPMvkJEuKYXm1-VcNnx9DBywEXCDHMJdLdBe9vdA_wMURKpVEVNC1V_aeJaOkh-cCWPlceqwzY5lDK-Q6dVBWXgQjA06BjtMtQGDMa744-n9tLutWn6YIlsXL8-9YOl11JTLi77kl/s200/ebay+826.jpg)
Stick a sharpened pencil through the center of the circle.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEik6JkCpP8FZjpNQZO4Eylg_Hu2TzZmmPXUWZm_2dg4Fx6y0op7moKCVTlSjB1UYbqZKPcHn2XB6nMbamdB9V-dDvjLnoAf-6CAONCrwKnxQUejJLmCvQUs0ppU_QfvRow8zsq21C_pmB4O/s200/ebay+827.jpg)
Spin the circle, and pencil, like a top. You might need to balance it between your fingers as it spins, to keep it from falling over, and you'll want to place a paper underneath, or you'll be drawing on your table.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvS4whOX4cOjvAJwQxO1KH99ac_ZKldJeUIgIVXKmrk50JbBHSp9TBhfiFTUqRnG_TqgdGH6qp1-OmAE8PtnNrY-s_EtcoQBBlBs2TjSbUKzAllH6INjOuQbrgd7XButGFePry6HUMs0pg/s200/ebay+830.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT8PFQs3xuhTtfRb8kLja_O6FwpQsogNbM4kQUKcpjRiWsmnBlnPxxF7gZGnCf35D-NHJv7BOSzAOToZx7Zq2goligZH5Yw8MvdAEJPYYf26XUWtisLaEC83X0TNhXHWcrS2hP62OkoFwD/s200/ebay+829.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvS4whOX4cOjvAJwQxO1KH99ac_ZKldJeUIgIVXKmrk50JbBHSp9TBhfiFTUqRnG_TqgdGH6qp1-OmAE8PtnNrY-s_EtcoQBBlBs2TjSbUKzAllH6INjOuQbrgd7XButGFePry6HUMs0pg/s200/ebay+830.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT8PFQs3xuhTtfRb8kLja_O6FwpQsogNbM4kQUKcpjRiWsmnBlnPxxF7gZGnCf35D-NHJv7BOSzAOToZx7Zq2goligZH5Yw8MvdAEJPYYf26XUWtisLaEC83X0TNhXHWcrS2hP62OkoFwD/s200/ebay+829.jpg)
Watch the colors as the top spins. The colors merge together.
It's a similar effect to what we saw with the thaumatropes we made a few months ago, except that it only suggests color to the brain. What I mean by this, is that each of the children in our house, saw the color differently. Using our disk that was half red, a quarter blue, and a quarter yellow, one child saw orange, one saw green, and one saw the colors underneath, with a glowing green over the top.
Scientists are still a little unsure as to what goes on between the brain and the eyes, that cause this optical illusion. It's the tip an interesting iceberg of study into neuroscience - but that's matter for another post.
It's great to be a homeschooler.
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