A modular energy absorber 10 that is tunable. It comprises one or more energy absorbing modules 12. The energy absorbing modules have means for coordinating energy absorbing units 16 of the one or more modules. The means 14 for coordinating position and support the units in relation to each other before, during and after relative motion between an incident object and the energy absorber. A crushable member 16 is provided that has an upper perimeter 22, a lower perimeter 24 and an intermediate wall 26 extending therebetween. It also includes a number (m) of breaches defined therein before impact. A method for configuring the modular energy absorber is also disclosed.