There are plenty of smart coffee tables around. Not all of them are cheap though. If you know your electronics, you can always build your own. jean.perardel has shared a guide that covers how you can use an old TV with a CCD sensor from an old scanner to build your own touchscreen table.
You may also want to see:
Touch screen coffee table CONFIGURATION
You are going to need a Raspberry Pi, Teensy, TV, and a couple of other components to complete this project. More info is available here.
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