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Arguments are given that support the interpretation of the lattice QCDglueball and gluelump spectra in terms of bound states of massless constituentgluons with helicity-1. In this scheme, the mass hierarchy of the currentlyknown gluelumps and glueballs is mainly due to the number of constituent gluonsand can be understood within a simple flux tube model. It is also argued thatthe lattice QCD $0^{+-}$ glueball should be seen as a four-gluon bound state.The flux tube model allows for a parameter-free computation of its mass, whichis in good agreement with lattice QCD.

Constituent gluon interpretation of glueballs and gluelumps