LivingOrganisms had to track their display icon, be able to set it, and be able to present it when requested. Tracking the display icon involved re-defining the class, but that was really easy to do.

Object subclass: #LivingOrganism
	instanceVariableNames: 'ocean live x y display '
	classVariableNames: ''
	poolDictionaries: ''
	category: 'FishWorld'
	
LivingOrganism methodsFor: 'display'

display
	Transcript show: display.

display: displayCharacter
	display := displayCharacter.