Hi Shanna,

Imagine that all two-dimensional objects are made of wire (lines). In this case, they cannot hide what is behind them. That is why the bed cannot hide the rug, even if it is in the foreground.
As Dean mentioned in his post, only opaque objects - wipeouts, solid hatches - can hide objects behind them if they are on the foreground.

Look at the attached drawing. I put WIPEOUT object in front of rug.