2D barcodes (like the one pictured here) all all the rage in Japan. They appear almost everywhere -- magazines, advertisements, food products -- and they "hyperlink the real world with the virtual world." A good example is clothing retailer H&M's use of 2D barcodes in European advertisments.
Soon on Spark, we'll ask Tokyo-based trendscout Michael Keferl why 2D barcodes are so popular in Japan, but haven't caught on in the west.
In the meantime, we want you to keep your eyes peeled for 2D barcodes. If you see one, snap a photo, then upload it to Spark's Flickr Pool. Include a note about when and where you saw it. One lucky barcode-spotter will win a spiffy Spark grocery bag.