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About 9 minutes · no sign-up · anonymous
Each screen shows one 3D object and one instruction, carried out by two systems, A and B. A single slider moves both at once: far left is the original object, far right the full edit. Drag on either object to turn both around. Both sides start and end with the same two objects; they differ in how they get from one to the other.
1. Which slider is better overall? All four together, weighted however seems right to you.
2. Which one spreads the change more evenly? Only the last property, ignoring the rest.
Each step of the slider should change the object about as much as the step before. A dead zone is a stretch where dragging does almost nothing; a jump is one small movement that changes everything.
The answer buttons unlock once you have moved the slider across, both ends included, and turned the object by about a quarter turn. Sides are randomised and never named. You have 9 minutes; it stops on its own, and you always finish the pair you are on.
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