The year is 2050.  Bob goes close to light speed in his ship.  He sees a 100 meter train contract to 1 meter.  He gets back from his trip in the year 2100. Aliens from another dimension are looking at our block universe from 2050 to 2100.  Will they see a 100 meter train or a 1 meter train or something else? This is meant to support the argument that length contraction is an illusion and not actually happening.