Made a model of the house in “UP” for a project, how to make it look like it’s floating?

I’m solely in 12 months 11 of highschool, and I’m presently combating this undertaking of constructing the completed home look like its “floating”. I’m considering of placing a hidden wall on the again and simply glue it on, but it surely stored bending as a result of weight. Can also’t discover something on-line. Any ideas?