i like that by the time you go into the tree hole you know exactly where to click despite the lack of an arrow.
then you get into the geometric line room and everything changes.

there's something really fundamentally exploratory about going into holes, and juvenile too. it's so natural to duck into a boar's path in the bushes when you're little, but once you're big it's different. it's always more sensible to go around or t o just peer in. you'd wreck it or a park ranger would yell at you or you'd get dirty.