In order to help patients, practitioners and researchers to better understand cells, morphogenics and functional behaviors, Onteis posits that a theoretical approach of medicine is required. Onteis provides tools to visualise relevant aspects of biological organizations on the basis of this theoretical standpoint. Example: cardiac representation in 2D-biological time A theoretical approach of organisms requires a specific temporality. Here the heartbeat is geometrically represented in 2D-time where one of the dimensions, specific to organisms, is circular and the other, related to the oriented thermodynamic time, is one-dimensional. The fractal like shape of the circles shows the multi-scale structure of biological variability and their underlying trend to follow power laws. This fractal-like structure originates from both unpredictable internal and external variations of biological constraints. Onteis provides tools to manipulate and visualise the variations of constraints as graphs, both at the biological level and at the level of patient expectations.