“…More specifically, the CFT dual of the higher spin theory is a subsector of the untwisted sector of the symmetric orbifold, and the entire untwisted sector can be understood in terms of a vastly extended higher spin symmetry, the so-called Higher Spin Square (HSS), as well as its scalar field excitations [11,12], see also [13,14] for related discussions. On the other hand, it has been more difficult to characterize the twisted sector of the symmetric orbifold from a higher spin perspective -see however [12,15,16] for first steps in this direction. This is an important problem if we want to use the higher spin perspective for the description of string theory at its highly symmetrical tensionless point.…”