2018
https://johncarlosbaez.wordpress.com/2018/03/26/seven-sketches-in-compositionality/
Seven Sketches in Compositionality: An Invitation to Applied Category Theory
https://arxiv.org/abs/1803.05316
https://arxiv.org/pdf/1803.05316.pdf
https://math.mit.edu/~dspivak/teaching/sp18/7Sketches.pdf