The Wonder Weave loom is a tiny 4 inch rigid heddle loom from the 1960’s. As you can see from the beginning of the video, the loom is tiny, making four inch squares or two by four inch rectangles.
This little loom is much more versatile than it looks at first glance. You can weave plain, single coloured squares, but without the heddle you can make all sorts of patterns using just the needle to go over and under different numbers of threads, work clasped weft and all sorts of simple techniques.
Check out this video made by Twill Power on YouTube, and you can download the instruction book below.