Generating for display an indicator of hidden objects in response to user input is disclosed. An input for moving a pointer presented in a user interface toward a first virtual boundary is received. The movement of the pointer toward the first virtual boundary is generated for display. An action is triggered in response to receiving input for movement of the pointer across the first virtual boundary after the pointer crosses the first virtual boundary. An object is generated for display in the user interface in response to receiving input for movement of the pointer across a second virtual boundary.