Hey, it’s Joe’s interdimensional portal!  This is actually the first time I drew it, with its appearance at the end of Joyce and Walky! being in something I wrote/drew later.   Joe’s company, Rosenthal Industries, is a place Shortpacked! had visited a few times before, but here’s our first look at its basement.  I’m sure Walter Peck is very upset somewhere nearby, and as per usual he’d probably be right.