Highlight a Cell with a Change

This is not exactly what I wanted to do, but I think it might be useful nonetheless. 

A while back I saw that Ben Collins had a sheet where the rows and columns would have a highlight wherever the cursor was. Since this is the summer of doing, I wanted to replicate that. 

Well, I didn't, but I was able to make a sheet that highlights the last cell that was changed. I wonder what a spreadsheet that showed the last three changes - as a gradient - might look like.

Anyway, the file is below.

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