Harris likes to watch birds and other critters from the safe vantage point of a windowsill. We are lucky to have seven very wide sills, which look like they were made for cats. They're also ideal for plants; I'm planning to grow some cat grass in a sturdy planter, since I've read recently that it's very good for them. They will be able to munch while watching the world go by.
It's been a long time since I've seen an outdoor, stray, or feral cat roaming our neighborhood, and I'm glad.