Rinse your finger in water after each one. Now dip your finger into the blue paint and add a drop to the yellow. Rinse your finger. Rinse your finger. Dip your finger in red and add drops to blue.
Lines can be straight or curved, short or long.
Let's find some lines in this art work. The border of a shape is called a contour, but artists sometimes delineate the borders to look more like lines. Draw three types of lines on a piece of paper. Then make them into shapes. Then make the shapes into objects and name them.