i can fill my day with unimportant tasks , so that no one need know or ask about the course of our psychohistorical research , but the trouble is , i do fill my day with unimportant tasks and i have insufficient time to- '' his eyes glanced around his office at the material stored in computers to which only he and amaryl had the key and which , even if anyone else stumbled upon them , had been carefully phrased in an invented symbology that no one else would understand .