To Scale

    How long is its longest side?

    20 cm

    Drag the slider, or drag up and down on the picture.

    How to play

    Museum photos hide how big things are. A coin and a cathedral door can fill the same frame.

    1. Look at the object.
    2. Make it the size you think it really is, next to the visitor and the mug.
    3. Lock it in. Then see its real size.

    Five objects a day. Within 10% scores 100. Off by 8× scores 0.