Figure 12.13 — User interfaces for controlling haptic optical tweezers Figure 12.13 — User interfaces for controlling haptic optical tweezers. (a) Optical tracking of markers on a user’s hand. (b) Optical tracking of hand positions using a Microsoft Kinect game controller. (c) Multi-user touch-screen table-top controller. (d) Haptic optical tweezers utilising the Novint Falcon interface.Figure (a) is reprinted from Whyte et al., Opt. Express 14, 12 497–502. Copyright (2006) The Optical Society.Figure (b) is reproduced with permission from McDonald et al., J. Opt. 15, 035708. Copyright (2013) IOP Publishing. Reproduced by permission of IOP Publishing. All rights reserved.Figure (c) is reprinted from Grieve et al., Opt. Express 17, 3595–602. Copyright (2009) The Optical Society.Figure (d) is reprinted from Pacoret and Re ́gnier, Rev. Sci. Instrumen. 84, 081301. Copyright (2013) American Institute of Physics.