Unusual classifications
An interesting mechanic in creatures is the classification system. To save computing space, and to simplify the brain creatures don't see specif9c instances of an object, but group everythin into classes. There is no such thing as a ball or racecar: both are toys. Many players likely remember that confusion from their first play sessions. It's a brutally simple system, but it works effectively. the more classifications you have at your disposal, the more interesting your creatures' interactions with the world are. Many classes like food, fruit, toys, plants are very common and are used by both creature labs and the playerbase. However, a few are very uncommon. Because the options for classes are limited as it is, it might be interesting to look at these and wonder why/ wonder how else we can use them. Bad: used only for volcano rocks in the desert terrarium. I suppose such a class could only ever be used for things that your Norns should never touch, and even retreat from...
