The clock segments are thin and hidden underneath the fabric. They consist of silicone and give the emboss feel via a slat of EPS (electroactive polymer, used for artificial muscles). When activated by electricity, the slat expands and lifts up the silicon segment; giving us the embossed numbers of the clock.
Apparently you can even wash the sheet; the silicon segment and the EPS slat are fixed in a small case. The small cases are arranged on a platen. When you want to wash the sheet, you just remove the platen with the clock components.
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