Do you know why horse fences are usually white? It’s because dark ones are harder for horses to see. The same principle applies to deck railings and people.
If you want an unobstructed view, dark spindles are the way to go. And round is better than square.
A 20mm-diameter round spindle stays 20mm no matter which direction it’s viewed from, but a 20mm-square spindle grows to more than 2.5mm when you view it at an angle.
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Source: Family Handyman