Solution: The sixth shape, the circle, is the odd one out. Its color doesn't align with the established pattern, where the circle should be yellow based on the previous shapes. Brain teasers like ...

This image shows an example of a colour wheel close colour wheelA circle showing different groups ... Hilma af Klint's work uses bold colours and geometric shapes. She also used shades and tints ...

Do you know what a circle looks like? Can you name some other shapes too? A two dimensional (2D) shape is made of lines. Sometimes the lines are curved and sometimes the lines are straight.