In the case of the four-dimensional bosonic higher-spin theory the relevant higher-spin algebra is very simple thanks to s o ( 3 , 2 ) ∼ ∼ s p ( 4 , R ) and can be built upon two-dimensional quantum Harmonic oscillator. In the latter case two pairs of creation/annihilation operators a 1 , a 1 † † , a 2 , a 2 † † are needed. These can be packed into the quartet Y ^ ^ A , A = 1 , . . . , 4 of operators obeying the canonical commutation relations