How to make a grilled cheese sandwich

What do a grilled cheese sandwich and information design have in common?  Both are activities that involve the practice of organising information (or ingredients!), simplifying complexity and, also very important, having fun! “How to make a grilled cheese sandwich” is

how would you define a diagram?

Yesterday, a friend, who is also doing her PhD related to diagrams (University of Granada), sent me an email asking me that question. She also sent me a kind of research she has been done in Google images. She introduced