Version 1.55b makes symmetrical images very, very easy. The Crop command in the Document palette allows you to increase the canvas size without stretching pixols. So I was able to do that, duplicate my layer, and then just flip, rotate and move things around until I had the four quadrants filled.
Anyway, Refraction is new to version 1.55b and is very easy to use. It’s in the Draw palette, and any time you draw a 3D object with less than 100% RGB Intensity, it becomes available for you. You should first unpress the L button, though, so that you can adjust the RGB Intensity slider without decreasing the Z Intensity.
The default setting for Refract is 0. Increasing that setting results in a convex lens effect – magnification. The maximum value is 100. Decreasing the setting (a minimum of -100) results in a concave lens effect – everything viewed through it will be compressed toward the center.
Refraction is very different from material-based Transparency in a couple of ways. First, it cannot see anything on another layer – it will only refract what is on the current layer. So you have no need to create new layers and turn off Flatten Layers. Second, it can only see unshaded RGB values. Material-generated color will not be visible. So if you wish to refract something that has colors created by materials, you must first bake the layer before drawing the refractive objects.
Another cool thing is that objects can refract each other. I used that quite a lot here. However, bear in mind that the refractive effect is only “live” until the object is snapshot to the canvas. New objects moved behind a refractive object after it has been drawn will not be seen through it. So draw the most distant refractive objects first and then work your way forward.
Hope that helps you out!