Tactile illusion via tangential skin strain

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Implementation of the tactile illusion described in the following publication: Masashi Nakatani, Akihiro Sato, Susumu Tachi, Vincent Hayward. Tactile illusion caused by tangential skin strain and analysis in terms of skin deformation. Proceedings of Eurohaptics 2008, LNCS 5024, Springer-Verlag, pp. 229-237. You can download the scientific article here: https://www.researchgate.net/publication/221011688_Tactile_Illusion_Caused_by_Tangential_Skin_Strain_and_Analysis_in_Terms_of_Skin_Deformation I have attached Figure 1 from the article, where it explains how the illusion works. Do the following: 1) insert the protruding element into the receiving element; 2) place your index fingertip on the rugged region in the middle, while holding the non-rugged square nearer to you with your thumb and middle fingers; 3) slide the element further from you back and forth, using your other hand. As you do this, you should feel either a bump or a groove under your index finger, depending on which element is oriented towards you and which one is oriented away from you. This means that, if you feel a bump, you should then be able to rotate the device by 180 degrees so that you are now sliding the other element, and you should feel a groove. Try it!