This Week's Finds 11: n-categories 

Here I explain categorification, and n-categories, in a simple introductory way. I apologize for the poor quality of this recording.
This is one of a series of lectures at the University of Edinburgh on topics drawn from my column This Week's Finds. This is the first lecture of 2023. For other lectures go here:
math.ucr.edu/ho...
The cover picture was drawn by Christian Williams when taking notes on a course I gave.