Clay Street is an NGO that works with visually impaired people in Singapore.
They organize various workshops for groups; we were 20+ and spent a couple of hours at the workshop. While the team had been very talkative till now, the silence was mesmerizing, everyone deep in though with their hands deep in clay.
We made some mugs that were later dried and baked. After 2 weeks or so, everyone received received their mug.
There are many options and the See No Clay team is very versatile; the best is to call them to discuss options. See more options here