Sometimes you just want to weave slowly, picking warp threads with a needle as you go. For very thin pieces, this works just fine. It can be very meditative.
But most of the time, when weaving tapestry, picking each warp as you go can get tedious and very time consuming, especially with wider pieces. For this reason, even the very first Mirrix Loom was designed with a shedding device. The word “shedding device” is derived from the word “shed” which means the space between lowered and raised warps. It raises the threads for you so rather than have to weave under and over warp threads with a needle, you can simply engage the shedding device and raise every other thread all at once. The shedding device is attached to the warp threads with heddles, which wrap around the individual warp threads and are hooked onto one of the two bars on the shedding device.