"The “lickable screen,” called the “Norimaki Synthesizer,” uses five…

"The “lickable screen,” called the “Norimaki Synthesizer,” uses five different gels, each corresponding to the five tastes the human tongue can distinguish between — salty, acidic, bitter, sweet, and umami. By weakening and strengthening these five different tastes through the use of electrical currents, the device can reproduce any “arbitary taste,” according to the research.”

https://futurism.com/the-byte/device-simulate-any-flavor