an Hourglass Structure. The image would feature two hourglasses stacked on top of each other, where The top hourglass represents the old, one-step process, with the sand flowing from the top to the bottom in a single, continuous action (symbolizing one visit and one complete action). The bottom hourglass is split into two chambers, representing the new, two-step process. The sand flows from the top chamber to a middle chamber (labeled "Visit 1"), and then it flows from the middle chamber to the final chamber (labeled "Visit 2"), --ar 16:9