In theory it doesn't matter what the frame of reference is. Instead of thinking of it like spin, think of it like heads or tails. Both are binary measures and

In theory it doesn't matter what the frame of reference is. Instead of thinking of it like spin, think of it like heads or tails. Both are binary measures and frame of reference doesn't matter. For example if you're flipping a penny on a glass table and someone is looking from the bottom, they'll see the same ratio as you. In a fair universe you'd expect pretty much a 50/50 heads/tails clockwise/anti-clockwise outcome. But instead we something like 66/34 or 75/25. The actual direction of spin doesn't matter. The fact the measurement is unbalanced does.