Another in the Judge Dredd Mega Collection. Mid-period Anderson stories. All but one in black and white. Writer; Alan Grant. Artists; Mick Austin, Carlos Ezquerra, Ian Gibson, Arthur Ranson and David Roach. Cover art; David Roach Contains my first Anderson story, Triad, which I still find a curiosity for its use of a technique of taking many copies of a drawing, slicing them into slightly dissimilar strips and pasting them to make an extended version of the original image. If you are wondering, I was, here are two definitions of the word engram. - A hypothetical permanent change in the brain accounting for the existence of memory; a memory trace. Oxford dictionaries - A physical alteration thought to occur in living neural tissue in response to stimuli, posited as an explanation for memory.. The Free Dictionary