Abstract： The possibility of producing non-perturbative low-scale gravity states in collider experiments was first discussed in 1998. The ATLAS and CMS experiments have searched for non-perturbative low-scale gravity states using the Large Hadron Collider (LHC) with a proton--proton centre of mass energy of 13 TeV. These experiments have now seriously confronted the possibility of producing non-perturbative low-scale gravity states which were proposed 20 years ago. I will summarise the results of the searches, give a personal view of what they mean, and present some models in which low-scale gravity would not have yet been seen at the LHC.