Kogin Coaster Kit - Yuki
Kogin is a Japanese embroidery technique in which geometric patterns are made by stitching horizontally across fabric in a running stitch. Threads are counted and the pattern is made using a paper chart (which can be reused indefinitely!). This kit includes kogin fabric, thread, needle and chart, plus instructions on how to stitch and make up a coaster, which are in Japanese but are easy to follow.
Lots of information including how-to videos can be found here https://www.japancrafts.co.uk/about-kogin.html