Last night I was scooping cat litter boxes as I do every day and night. I have three HUGE ones that are nearly as large as children's sandboxes. They're about 3' x 2' and rectangular in shape. After I'd cleaned and refreshed them, Bailey and Elliot took turns slipping, sliding, and rolling around INSIDE the cleaned boxes, to which I'd added fresh litter. They had a ball causing the litter to fly out and scatter in every direction. They played, jumped in and out, ran back and forth among the boxes, and chased each other all over the place. I had to sweep up after them but I didn't care. They had so much fun. I don't know why cats enjoy climbing into fresh litter and scootching around but mine surely do. My little feral cat, Timmy, didn't join in the fun but he didn't run away either. He sat and watched, enjoying the show.