This digital hologram visualizes the Thiotimoline molecule, an imaginary chemical compound invented by the science-fiction writer Isaac Asimov. He published several spoof scientific papers about this compound, which due to a carbon atom that projects a bond into the future and one into the past, reveals « endochronic » properties. With the help of the chemist Pascal Tripet, I realized a « rigorous » tridimensional visualization of this molecule and freely illustrated the carbon atom that travels through time. A moving light source makes the motif progressively visible and interacts with two other artworks.