Embodiments described herein provide a system for generating a visual montage. During operation, the system may determine a plurality of layers in the visual montage. A respective layer is associated with a time range and a plurality of predetermined slots for assigning graphical objects. The system may obtain data representing a set of graphical objects and constraints associated with the graphical objects. The system may then obtain information associated with an event and a respective time from an ambient environment of a user. The system may determine that the respective time is within the time range of a specific layer. The system may assign at least one graphical object to the specific layer according to the constraints associated with the graphical object to generate the visual montage. The system may then display the visual montage with the graphical object representing the event on a display screen.