There's this big fat wall sitting in front of my kitchen window (it's probably the same wall you have in front of your toilet window, or someone else can see from his sleeping room window).
"My" wall is only a couple of feet away from the kitchen window, but it's far enough so I can't touch it when I lean out of the window (and I wouldn't want to try it as Im living on the fourth floor). Still the wall really looks like I should make some cool use of it. If the wall was made of steel, I could use huge magnets and put my shopping lists up there (just like other people do on their fridge doors). Technically I could always write down the shopping list on a piece of paper, stick it in a beamer and project it against the wall, but that's not really the convenience I'm looking for (also it would constantly use up energy). So what I need is a cool idea how I can use that "other" wall which isn't my property and where I'm not allowed to use screws or nails.