I worked with a graphic designer with aphantasia! If you will excuse the wordplay, I could never imagine what it was like inside her head, as her process would surely be very different to mine. But she was very skilled and had been doing it for years. She also didn't realise until she was in her 30s that it was something she had.

She was capable of fluently talking about changes and the effects they would have on the design and so the fact that this could all happen without ever picturing the changes was super interesting.