East Lansing has a unique art gallery store that’s been around for 30 years. The Mackerel Sky is more than a catchy name, though; it’s also a long story. A mackerel sky is a cloud formation that sailors talk about. It’s well-known on the coasts, and it looks like the scales on a mackerel fish. To sailors, it means a great change in atmosphere pressure is coming, which means a big shift is coming.