I can instruct you on how to obtain a QR code that will allow visitors to your house (or office) to simply hold their phone's camera up to the code to be instantly connected to your wifi network. Once you email the code to me, I can have it burnt onto a wooden plaque, stitched on a circuitboard, printed on stretched canvas, created out of sand or silver or executed in whatever style suits your space. Guests love the convenience, and they'll love you for providing it.