I have fun changing the gerbils layouts around. I don't do it often - once a month was the plan. With a major clean. They seemed content enough with just a ton of substrate and the driftwood. But after I did their big clean of the month after I set it all up and waited a week - I wasn't really happy with how I had it set up for them. And they didn't seem to either.
I thought I'd try this out and see what they did with it in a week. (Or maybe overnight).
A burrowing box! Since taking this they have started kicking out so much as they tunnel that then it falls over the sides and when they come back out to play down at the bottom they start rearranging the fallen substrate (which is a mix of Aspen shavings and shredded paper).
Mercury wants to give you the tour (they are seemingly loving it - climbing all over the place and tunneling like mad in the box.
In the Sand Bath (their new favorite toilet and grooming and zen meditation area) - in the food pot (Terra Cotta) and on the Overlook (the flat top portion of the driftwood) and now back into the burrowing box to investigate. (Lennon at this point was down in there busy as could be).
Now I have some more ideas for next month on what to do to change things around. It requires a trip to Lowes for wood.