“…The toy creates an engaging tactile experience by utilizing the rapid change in the reaction force when the rubber hemispherical dome is pressed and buckled by a fingertip. In addition to toys, mechanical switches or buttons, such as those used inside automobiles and keyboards, are associated with haptic sensations that affect user satisfaction (Gaspar et al, 2017;Hatzfeld et al, 2010;Kim and Lee, 2013;Li et al, 2013;Schütte and Eklund, 2005;Simon and Jörgen, 2005;Stamer et al, 2020;Vieira et al, 2017;Wellings et al, 2010;Zheng et al, 2022). Singular patterns of reaction forces and sounds (Burnett and Irune, 2009;Miyari et al, 2022) caused by the buckling or abrupt restoration of spring systems or mechanical levers determine the haptic comfort when the switches are pressed.…”