Excellent breakdown of the foundation for spatial pooling… I am really enjoying HTM School 
I have quick question on the “potential percent” parameter. The HTM Cheat Sheet thread mentions 2% as a standard for sparsity. I interpret that to be equivalent to setting the “potential percent” to 0.02 (idea being that 2% of columns with one cell per column active would represent an output SDR with 2% sparsity). Just checking if I am interpreting that correctly (I have misinterpreted this point previously, so making sure I have it correct in my mind this time).