As you can see from the first figures, blue was more commonly chosen color for square, yellow was the most common triangle color, and people really don't agree on the right color for a circle.

If your Garmin watch is showing a blue triangle, you’re not alone—users of Forerunner, Fenix, and Epix watches have been reporting this issue since January 28, and Garmin is looking into it ...

I explore the psychology of art in my upcoming book (Davies, 2014). Kandinsky's "Romantic Landscape," 1911 Kandinsky ran a little test on people and found yellow triangle, red square, and blue circle.