Specific processes include mechanical interlocking, electrostatic, diffusion interpenetration, adsorption and fracture processes. The immobilization by interpenetration of actin filaments results from two distinct ABP families. Mental health entails an open communication and interpenetration between the primary and the secondary process. Ullmannite commonly displays interpenetration twins as well as enantiomorphic twinning along [110]. This knot, net or web metaphor also conveys the Buddhist teaching of interpenetration. There is an interpenetration of cause and effect between the environment and life. Therefore, an additional pressure is generated to avoid interpenetration of the two surfaces.