No.. not Photoshop.. i think it was a glitch... I don't know what Liz did.. but she got those stuff up there... and we did have a party! (People got invited in global chat yesterday)
@ sock monkey, I've only seen this in the new [tester] houses. Though if you try jumping there from inside the house, you may indeed find that you hit your head.... EDIT: sounds like this may have been nerfed.