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In the building next door, families scratch desperately through thumbnail photos scattered in piles on the concrete floor – face after face staring grim and blank, silent witnesses to the years of Assad's rule.

To distinguish between more innocuous cases of narcissism and the literally dangerous varieties, Durvasula offered a thumbnail test: "Narcissists who are narcissistic do feel remorse," Durvasula said.

Customers can choose from goalkeepers presented with a thumbnail photo, short bio and information on the price.

They are made of stone or glass, variously coloured and tiny - often barely the size of a thumbnail.

Compared to the palm-sized prototype, the new versions are also much smaller -- about the size of a thumbnail -- and the researchers are aiming to miniaturise them further.