Gearfuse

Since smoke signals are somewhat obsolete in terms of technological advancement, this Lampex USB Magic Wand looks like it could do the trick for sending secret visual messages. Connect the Lampex to your PC, type in the message you want displayed, and then wave the little bugger through the air.

As you swipe it through the air LEDs (or perhaps some magical elf) blink in time to produce your message in midair. Can Harry Potter do this? I think not. Though we doubt this wand would be any help against The Dark Lord either. — Andrew Dobrow  

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Anyone with a blooming child knows that little doodles are bound to pop up on your wall at some point. Philips has developed a digital drawing gadget that not only allows children to color on walls, but encourages is it with his non-mess gizmo. The multicolor paintbrush, or “magic wand”, can be dipped into a digital paint can, which allows the selection of a spectrum of colors. The wand then projects a digital image, following every stroke of the child, on the wall, which can then be erased with the special eraser tool (or by unplugging the machine). Best thing about the Digital Drawer? No messes to scrub off the walls. — Andrew Dobrow

Digital drawing tools for your kids [GizmoWatch]