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. 2017 May 19;17(5):1166. doi: 10.3390/s17051166

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Computer visualization (a) of printed hair, with close view (b) and SEM photo (c) of actual printed hair; (B) Hedgehog with printed hair; (C) Printed hair arrays on curved surfaces; (D) Swiping speed mapped to the gray scale of the block; (E) 2D feature space for rabbit petting labeled using SVM classifier; (F) Direction of swiping on the hairy surface can be differentiated. When one swipes along the hair direction, the bunny turns green; when one swipes against the hair direction, it turns red. Reproduced from [17], with permission from ACM © 2016.