The thing in the middle of the bird bath is a water wiggler.
My reason for purchasing it was to keep the bird bath from freezing but it isn’t great for that. If it’s just a light freeze, it keeps the water from freezing. If it’s a medium freeze, there will be a pretty thick layer of ice but the center doesn’t freeze so I can remove the water wiggler, then pick up the whole sheet of ice and toss it. If it’s a hard freeze . . probably less than about 22º, the entire thing freezes . . water wiggler and all.
It is solar powered so it recharges itself. It does keep the water moving and that helps to keep mosquitoes from hatching in the water.
I recommend it for keeping the mosquito population down and for keeping the water from freezing during light freezes but if you’re looking for something to keep bird baths from freezing during really cold temps, this isn’t going to do it.
The other question — the sweater. Yes, it’s a test knit for Laura Aylor. I will let you know when the pattern is available. Sorry for not providing that info in this morning’s post.