and records, ie. development of synapses and neural pathways within the brain allowing mental recollection,and artefacts such as photographs or electromagnetic images.The past within the mind allows an organism to learn from experience and retain useful lessons for reference. Electromagnetic images may be seen but these are not the material past they are just images. There is aft space that has been passed through and afore space that has not been passed through, there is no material past or future to visit.Understanding this there are no time travel paradoxes. Imagination of the future is a creative function of the brain allowing anticipation and preparation.The present is actually a patchwork made from input that has taken various lengths of time to arrive and is pieced together by the mind to form experience of a present moment.Every observer experiences a different present moment because the patchwork of inputs and processing is different. Since past, uniform present and future are imaginary so is the time line along which they are imagined. Subjective time is related to observation of change in 3D space and assumption of simultaneous change in time, in one direction, that is regular and continuous.It is not related to objective reality except in that there is continuous afore-ward change in 4th dimensional position i.e. loss of Universal potential energy of all macroscopic objects. Although it is not absolutely uniform because motion in 3D space also affects 4th dimensional position. This relationship between perception of subjective time and process within objective reality