Another easy science project that I got from this book. Having this activity would also make rainbow-themed parties more interesting and interactive.
Fill a shallow dish with water. Put a mirror facing the morning or afternoon sun. I tried this several times before we got it right. The trick apparently is to have as much water as possible and to submerge most of the mirror.
You can move the mirror to control where your rainbow gets projected. At first we had a rainbow outside.
When I got tired of going out, I moved the mirror so we can have the window inside our house.
You can even project the rainbow on yourself.
Maybe if we have an aquarium and a big mirror, we can fill the living room ceiling ROYGBIV colors!