ceramics
I fell in love with pottery the first time I tried it. I enjoy a challenge and learning new things, and making pottery provides these opportunities.
Clay can sometimes be cantankerous. So, making a particular shape with clay requires planning, practice, or occasionally even bribery or trickery. Glazes often have to be convinced to play well together. The moods and opinions of the clay and the glazes on any particular day can have a strong effect. And then there are the irascible kiln gods, who also need appeasement.
Potters need to learn patience (timing is crucial) and the ability to let go of expectations. But the reward can be what was hoped and planned for, or sometimes, finding different but surprising beauty in the final product.
What fun!