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. 2015 Dec 2;5:17719. doi: 10.1038/srep17719

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Copyright © 2015, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The objects were constructed out of two 6 × 6 × 1.8 cm slabs of PVC. Object size was varied by varying the length of the spacer between the two slabs. In Experiments 1 and 2 we used three 180 g objects varying in size (4 cm, 5 cm and 6 cm) and one 230 g object of 5 cm, in Experiment 3, two more 180 g objects (4.5 cm and 5.5 cm, not shown) were added to the set.