Pictures are a mission critical for my thinking and my communication in software engineering. I would be hard pressed to discus the operation of any sort of d

Pictures are a mission critical for my thinking and my communication in software engineering. I would be hard pressed to discus the operation of any sort of datastructure beyond a linked list without sketching. For example a binary tree and it's traversal routines are (at least to me) much easier to understand with a picture along side the exact state.