I can see how a decision tree with 2 layers may be possible, but once it gets to 4/5 layers, I think the conditional information would be very hard to keep trac

I can see how a decision tree with 2 layers may be possible, but once it gets to 4/5 layers, I think the conditional information would be very hard to keep track. It's like looking at a heat/k map at 5 dimensions, it gets really taxing.