The second philosophy of tree spiking is to place the spikes in the trees well above the area where the fellers will operate — as many feet up the trunk as one can conveniently work. The object of the spiking in this case is to destroy the blades in the sawmill. Since in large mills the blades are either operated from a control booth some distance from the actual cutting, or are protected by a Plexiglas shield, this method is unlikely to cause anyone physical injury even should a blade shatter upon striking a spike, which is unlikely.