Those little colourful objects are stickers that contain an accelerometer, temperature sensors, a processor and Bluetooth connector. They can be attached to any surface or object to provide interaction with smartphones.
Stick one on an item in a retail store and it can tell the retailer how often the item is picked up and looked at by customers. Stick one on a bag and it can notify owners when it’s left behind. Place one in the bedroom and it will know if users are still in bed or have made it into the kitchen for breakfast, and sound an alarm if not.