I have always been fascinated by mental imagery, the ability of the mind to visualize images. Being fairly common amongst creative people, I had assumed that everybody can think in images (and other modalities, like sounds etc). Recently I found out this is not true; Aphantasia (from the Greek phantasia = imagination, a + phantasia = the lack of imagination) is the condition in which one lacks the ability to create mental imagery. That made me draw even closer attention to my own process of thinking visually. In this cartoon, I am reflecting on my mental imagery during a real dialogue I had with a friend, which resulted in a pun. The depiction of the imagery in the form pictograms is not a very accurate one. I did not really think in signs, but I wanted to highlight the almost mathematical origin of this joke; it is a creative twist on the idea that two negatives make a positive.