Panel 1: There are 4 phones laid out in a row showing the back of the phones, each one a different model. The first has one camera lens in the upper left corner, the second has two lens in a vertical line on a raised rounded rectangle, the third has 3 grouped together in a triangle pattern on a raised square, the fourth has 4 in a square pattern on a raised circle. (Note that these are based on real phone designs)

Panel 2: (continuing the phone evolution) there are two phones side by side showing the cameras on the back. The first has 5 cameras arranged in a pentagon pattern on a raised circle, the second has 6 cameras in a circular pattern on a raised circle.

Panel 3: There is one phone, a cellphone now with a rotary phone dial replacing the circle of camera lenses on the back of the phone along with a corded handset. A hand has lifted the handset and is dialing out a number on the rotary.