Gestures in Tangible User Interfaces
D. Anastasiou, and E. Ras
ERCIM NEWS, no. 120, p. 23-24, 2020
2D gestures have been extensively examined on surface and interactive tabletop computing, both in the context of training of predefined datasets and "in the wild". The same cannot be said for 3D gestures, however. The current literature does not address what is happening above the tabletop interfaces, nor does it address the semantics.
https://ercim-news.ercim.eu/en120/special/gestures-in-tangible-user-interfaces