I finally got out the instruction booklet and did a bit of reading then snapped a few photos of the kittens. They are amazingly cooperative about being photographed, until one of them notices the dangling camera cord (why on earth did I put that on?) and decides that is much more interesting than sitting and posing for a picture.
They both love to sit in the kitchen window because they can see the bird feeder from there and sometimes, to their delight, a bird will actually whiz by the window, giving them a real closeup. It's quite a jump from the floor, easily 6 times their height and the sill is relatively narrow, but they manage it quite gracefully. Gone is the clumsiness of kittenhood! They are just a bit more than 6 months old now and I wonder how much bigger they will get.