How do we get an idea from the physical world? There is basically only one possibility, namely the dialogue with nature, i.e. we create a theoretical conception of the world by thinking, and then we check this conception with the help of measuring instruments. In this connection the following question arises: Does there exist for each element of the theory an element-specific deflection at the measuring instrument? In other words, has each element of the theory a counterpart in the actual reality? If not, then the theory contains metaphysical elements, i.e. elements which have no counterpart in reality. In this book it is argued that there are obviously no theoretical conceptions of the world which are free of metaphysical elements. This is not only valid in connection with matter but also for the conceptions of space and time. The consequences in connection with modern conceptions of the world are outlined.Contents:The Observable and the Non-Observable:ExperienceCosmos As a Collection of Matter in SpaceElements of Quantitative DescriptionWhy Do Planets Move?Summary and Final RemarksMatter and Maxwell TheoryConsequencesStructured Matter:Elementary MatterConventional Elementary ParticlesThe Connection Between the Theory of Relativity and Quantum TheorySuperstrings and TwistorsLevels of Reality:Perception: How Does It Work?Pictures of RealityLevels of RealityEverything is in the PictureGeneralizationOverviewAppearance:Correlations in SpaceExamples of the Principle of Level-Analysis“Things” at the Levels of RealitySpace and Time:Possibilities of PortrayalOther Spaces, Other ParticlesSuperstrings and Twistors: Two Alternative World Views?OverviewOutlook:On the Application of the Principle of Level-AnalysisQuantum Theory of the Principle of Level-AnalysisWhat Does Reality Mean?Readership: General.Key Features:Most existing publications on Iraqi history present a succession of tragic events which would lead the reader to assume a sort of fatality in the country's evolution towards the present situationDue to deeper observation and analysis (between the local, the regional and the global; between internal and external), the authors offer, in contrast, new grids of analysis on Iraqi history rejecting a primordialist approach that establishes ethnic and sectarian borders as the self-evident reasons of the present situationContributors to this book are well-established researchers in their field