Experimental set-up for <b>Experiment 1</b>

<p>A: The two halves of the mould, with a sphere in the right half. B: The experimental set-up of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045298#s2" target="_blank">Experiment 1</a>. A bundle of four spheres (one dark target sphere) hangs from a tripod placed on a weighing scale. Underneath the hand lies a resting cushion.