But that's the point. If in a blind test you can't tell the difference, then there is very little to no perceptible difference. If testufo was randomized with

But that's the point. If in a blind test you can't tell the difference, then there is very little to no perceptible difference. If testufo was randomized with multiple repeating patterns and random offsets, it could be a much better test. Here you can accidentally bias yourself.