A way of making solid-color transparent rectangles of any size by taking advantage of the fisheye effect. This uses a specific costume that places a single pixel square at the center of one edge of the sprite's bounding box. Applying the fisheye effect to this costume allows control of the width of the square. This stretch is imperfect, though, since the fisheye effect is radial in nature. At extremes, the square visibly gets distorted into more of a trapezoidal shape. The costume is made large to mitigate the effect, but it's still slightly visible in certain cases. I made this to potentially use in a clone-based UI engine that doesn't affect the pen layer. I've since created that UI engine. It can be seen in use here: https://scratch.mit.edu/projects/650322979/
