What's with the head against the wall?
I could see banging your head if I started in on the health decline of the domesticated feline as a result of this:
http://pets.thenest.com/jonny-cat-litter-8582.html and tied it to the stay at home wives of the late 50s early 60s moving into the work force and demanding more convenient options to deal with feline waste. Then came the indoor only movement which brought about the expansion dry foods (strictly a convenience factor for humans) that lead to designer foods (hills, iams) then the pet care boom, that morphed into the vet care boom bringing human grade health care to cats. Now we are here among friends wondering why our cats are diabetic. Because of cat litter.......
Recap:
Cats were working animals
A few of society's wealthy individuals had indoor felines as a show of status
As discretionary income rises, more families can afford cats
Sawdust, sand and newspaper were commonly used for feline waste
WW2 brought about an elimination of canned dog food and manufactures moved to dry food
As dry food moves into the market, companies add that to their offerings as income rises after the war
Johnny Cat came to the mass market
Women left the home and entered the workforce demanding easier time saving options
Indoor only movement starts to take hold
Booming growth in the pet industry
Growth in pet care
Bringing human grade care to cats
Ok, now brain is tired and I need to go back to cleaning cat boxes.
Or I need a nap. That was too much thinking.