From a Yanko Design online article:

Molo’s Float Tea Lantern presents an absolutely new way of brewing and consuming tea that’s still steeped in tradition. The brewer features a double-wall construction, with enough space below the inner vessel for a tea-light candle to help keep your brew warm. A perforated glass chamber sits atop the ‘kettle’, allowing you to brew green tea as it filters through into the kettle, being heated to consumption temperature by the candle. The double-wall construction proves handy here, allowing you to lift and serve the vessel without feeling its heat, as the outer wall stays conveniently insulated against high temperatures thanks to a constriction in the middle of the kettle’s design. 

https://molodesign.com/collections/glassware/

To read more click on following link: https://www.yankodesign.com/2019/08/02/molos-floating-glass-tea-brewer-is-a-fusion-of-culture-and-future/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+yankodesign+%28Yanko+Design+-+Form+Beyond+Function%29