A process of forming a desired image of an object, the process comprising: using an image forming apparatus, wherein: the image forming apparatus houses two identical image forming assemblies; the two identical image forming assemblies are arranged on a horizontal base and have a parallel orientation; the two identical image forming assemblies are arranged at equal distance from a center line between the two identical image forming assemblies and running perpendicular to the horizontal base, and separated from each other by a further distance equal to another distance between a human pair of eyes viewing the object positioned on the center line; the using comprises: forming a left half of a left image of the object via a left one of the two identical image forming assemblies; forming a right half of a right image of the object via a right one of the two identical image forming assemblies; the process further comprising: obtaining the desired image by removing the first right half of the left image and the second left half of the right image and by joining the first left half of the left image and the second right half of the right image so that a first vertical central line of the left image coincides with a second vertical central line of the right image. using an image forming apparatus, wherein: the image forming apparatus houses two identical image forming assemblies; the two identical image forming assemblies are arranged on a horizontal base and have a parallel orientation; the two identical image forming assemblies are arranged at equal distance from a center line between the two identical image forming assemblies and running perpendicular to the horizontal base, and separated from each other by a further distance equal to another distance between a human pair of eyes viewing the object positioned on the center line; the using comprises: forming a left half of a left image of the object via a left one of the two identical image forming assemblies; forming a right half of a right image of the object via a right one of the two identical image forming assemblies; the process further comprising: obtaining the desired image by removing the first right half of the left image and the second left half of the right image and by joining the first left half of the left image and the second right half of the right image so that a first vertical central line of the left image coincides with a second vertical central line of the right image. the image forming apparatus houses two identical image forming assemblies; the two identical image forming assemblies are arranged on a horizontal base and have a parallel orientation; the two identical image forming assemblies are arranged at equal distance from a center line between the two identical image forming assemblies and running perpendicular to the horizontal base, and separated from each other by a further distance equal to another distance between a human pair of eyes viewing the object positioned on the center line; the using comprises: forming a left half of a left image of the object via a left one of the two identical image forming assemblies; forming a right half of a right image of the object via a right one of the two identical image forming assemblies; the using comprises: forming a left half of a left image of the object via a left one of the two identical image forming assemblies; forming a right half of a right image of the object via a right one of the two identical image forming assemblies; forming a left half of a left image of the object via a left one of the two identical image forming assemblies; forming a right half of a right image of the object via a right one of the two identical image forming assemblies; the process further comprising: obtaining the desired image by removing the first right half of the left image and the second left half of the right image and by joining the first left half of the left image and the second right half of the right image so that a first vertical central line of the left image coincides with a second vertical central line of the right image. obtaining the desired image by removing the first right half of the left image and the second left half of the right image and by joining the first left half of the left image and the second right half of the right image so that a first vertical central line of the left image coincides with a second vertical central line of the right image.