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. 2020 Apr 28;14:20. doi: 10.3389/fnbot.2020.00020

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Copyright © 2020 Cao, Xiang, Tang, Ju and Pang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experimental setup. (A) Structural schematic of experimental setup: (1) rubber ball, (2) connecting rope, (3) aluminum frame. (B) Photographic impression of experimental setup in operation.