It was at dusk. A very large, maybe even cruse ship size slowly turning dark low profile triangular shape. With dare I say.. beautiful multi colored pulsing lights. let's just say I wish I had lights like these to dance to (53 yo hippie type here) sorry lol. The flight characteristics seemed very similar to that of like a slow moving low flying tourist/surveying helicopter. It was almost right overhead, but still silent. I'm from Los Angeles where we have police search helicopters all the time, but up here in Humboldt our police don't use them yet. So in shock, I at first thought I had spotted a police helicopter searching for something/someone. But quickly I realized it was 100% silent, unlike any helicopter I'd ever seen. I first began to thing it was 3 lights, but then could start to see the dark underside and dark triangular outline as it slowly moved overhead. It massive looking airship. I've never seen anything in my life before this, even though I was scared and am still scared of the idea.. I'm just as grateful to get a glimpse of whoever that was. Maybe it's our military, who knows!?Thanks for taking my story.Coletta.