1 2 Harald Atmanspacher and Hans Primas 1 Institute for Frontier Areas of Psychology, Freiburg, Germany,haa@igpp.de 2 ETH Zurich, Switzerland,primas@phys.chem.ethz.ch Thenotionofrealityisofsupremesigni?canceforourunderstandingofnature, the world around us, and ourselves. As the history of philosophy shows, it has been under permanent discussion at all times. Traditional discourse about - ality covers the full range from basic metaphysical foundations to operational approaches concerning human kinds of gathering and utilizing knowledge, broadly speaking epistemic approaches. However, no period in time has ex- rienced a number of moves changing and, particularly, restraining traditional concepts of reality that is comparable to the 20th century. Early in the 20th century, quite an in?uential move