Yes, it looks gross--like shredded blood vessels or color-coded spinal cord. In other words, nothing you want to see. However, this graphic shows the trends in the party affiliation of the members of both the House and Senate. A constriction on one side of this blood vessel means a big loss.
As volatile as control of the House and Senate has seemed in the last 30 years, it's nothing compared to the political shredding in the first 150 years of our republic. I was lulled by growing up during the relatively stable period between 1946 and 1978, but I definitely don't want to go back to that. I'm fine with throwing them out rather than letting bad policies get entrenched.