🎛️ Line Bisection Test: Can You Eyeball the Exact Middle?

You mark the point you believe is the exact middle of a horizontal line, and seven lines follow, each a different length and position. Every line is generated fresh, so there is nothing to memorise between attempts, and your error is measured as a percentage of that line's own length, which puts long and short lines on equal terms. Most people drift consistently towards one side, so the result also shows you which way your own eye leans.