If you have ever wondered how suncatchers make rainbows, the short answer is that light bends through crystal, not through the acrylic piece itself. A SunCatchery suncatcher has two parts working together: a printed acrylic piece for color, and an optional cut crystal drop that hangs below it for the rainbow effect. Once you understand what each part is doing, it is much easier to hang yours where it will actually work, and easier to guess when the rainbows will show up.
How Suncatchers Make Rainbows Start With Refraction
A rainbow is what happens when white light gets split into the colors that make it up: red, orange, yellow, green, blue, and violet. Sunlight enters one facet of a crystal, slows down, and bends. Because each color of light bends by a slightly different amount, the colors separate on the way out, so you see a spread of color instead of a single beam of white light. This is called refraction, and it is the same basic idea as light passing through a prism, or the way a puddle of water can throw a faint bit of color on a sunny day.
On a SunCatchery piece, this work is done by the optional cut crystal drop that hangs below the acrylic. The crystal has many small flat faces cut at angles, and each face acts like its own tiny prism. That is why one crystal drop, in the right light, can throw several small rainbows onto a nearby wall or floor at once, rather than a single wash of color. The more faces catching light at once, the more little rainbows you will see scattered around it.
Why a Flat Acrylic Piece Glows Rather Than Splits Light
The acrylic part of a suncatcher works differently, and that difference is on purpose. Each piece is cut from 3mm clear acrylic, with the design printed on the frosted back and the whole piece cut to the outline of that design. Acrylic is lighter than glass and does not shatter, which is one reason it works well for a piece that hangs and moves in a window without needing a heavy frame or mount.
Because the front and back of the acrylic are flat and run roughly parallel to each other, sunlight passes through without bending much. There is no facet to split the light into separate colors. What you get instead is a soft wash of color from the printed design, lit up from behind by daylight. That glow is lovely on its own, and it does not need direct sun to show up. It just needs enough daylight coming through the window, which is why the acrylic piece can still look good on an overcast day when the crystal has nothing to work with.
The Angle of the Sun and the Time of Day
The crystal drop only throws rainbows when direct sunlight hits it at the right angle, so the time of day matters. A window that gets direct sun in the morning will show rainbows in the morning, and a west-facing window will do the same in the afternoon. On a cloudy day, or in a spot that only gets bright, indirect daylight, the acrylic will still glow, but the crystal will not have direct light to split. The season plays a part too, since the sun sits lower in the sky in winter and higher in summer, which changes how far the light reaches into a room.
For the best chance of catching that direct light, hang your suncatcher from a chain, from one point, high in a window that gets sun for at least part of the day. Because acrylic is so light, a small suction hook is enough to hold it in place, with no drilling or heavy hardware needed. For more detail on hanging height, and on keeping the piece clean without clouding the print, our hanging and care guide walks through it step by step.
Getting Rainbows to Travel Across the Room
Once the crystal is catching direct sun, the rainbows will not stay in one place. As the sun moves across the sky, the angle of light hitting the crystal changes, so the small patches of color drift across the wall, floor, or even the ceiling over the course of the day. A window with a longer stretch of direct sun, rather than just a few minutes of it, gives you a longer show and more room for the rainbows to travel, especially in a room with pale walls or light floors where the color shows up clearly.
If you want to see how different designs catch the light, our full collection is a good place to browse, and the celestial collection is a natural match for anyone drawn to sun and sky themes. Wherever you hang it, give the piece a little room to turn on its chain. A gentle turn changes the angle just enough to send the rainbow somewhere new, so the same suncatcher can surprise you at different times of the day.