How a Brass Kaleidoscope Is Made: From Tube to Mirror Alignment
Updated: 2 days ago
By Rocco (Roi) Ramon - licensed architect, founder of Studio Yabaye
A brass wheel kaleidoscope has three assemblies: a body, a mirror system and one or more object wheels. Each is made separately and each has its own source of error. The body has to be straight and square. The mirrors have to meet at the correct angle along their full length. The wheels have to pass light and turn in front of the mirrors.
This article follows the making sequence in the order I read it as an architect: structure first, then the optical core, then the moving parts, then inspection. It separates two kinds of statement. Where I describe my own studio, I say so. Everything else describes how kaleidoscopes are made by makers in general, and is not a record of my own methods.
For the optics behind the image, see how a kaleidoscope works.
The brass tube: cutting and fitting
In my studio the body is a brass tube, cut, fitted and hand-finished in the studio. Brass is an alloy of copper and zinc. My pieces measure between 9 and 28 cm in length, without the stand.
In general terms, the length of a kaleidoscope body is not a free choice. It follows from the mirror length, and the mirror length follows from the proportions of the image. That relation is explained in kaleidoscope mirror length and width ratio.
Any maker who cuts a tube has to deal with two things afterwards. The cut end has to be brought square to the axis of the tube, and the burr that the cut leaves on the edge has to be removed. What to check: the joint between the tube and the parts fitted to it should be an even line around the full circumference.
Hand-finishing the surface
The range has three finishes: matte, glossy and dark (blackened brass).
Bare brass reacts with air and with skin contact, and its colour changes over time. A maker either accepts that change or slows it with a surface treatment. In my studio the treatment varies from piece to piece: matte lacquer, wax, polish, or no coating at all.
Front-surface mirrors
An ordinary household mirror carries its reflective layer behind the glass. Light passes through the glass, reflects, and passes through the glass again. The front face of the glass also reflects a small part of the light, which produces a second, weaker image offset from the first. In a kaleidoscope the light is reflected several times, so the offset is repeated and the lines where the images meet appear doubled.
A front-surface mirror, also called a first-surface mirror, carries the reflective layer on the face that the light meets first. The light does not pass through the glass, so there is no second image.
I work with front-surface mirrors, cut to size for each model, and build front-surface mirror systems in several configurations: there are two-mirror, three-mirror and four-mirror models in the range. See two-mirror vs three-mirror kaleidoscopes and types of kaleidoscopes. The long edges matter most in any kaleidoscope, because they form the joints that the eye sees as the lines between the reflected sectors. A chipped or uneven edge shows as a line running through the pattern.
Assembling and aligning the mirror system
This step decides the quality of the image in any kaleidoscope. The description below is the general principle, not a description of my own method.
Two-mirror system. Two reflecting strips meet at an angle, and in the common construction a third, non-reflecting side closes the wedge. The image is a single circular figure. For the figure to close, the angle has to divide 360 degrees an even number of times: 45 degrees gives 8 sectors, 30 degrees gives 12. If the angle is off, the last sector is wider or narrower than the others.
Three-mirror system. Three reflecting strips form a closed triangle. The image is a repeating field that extends to the edge of the view, so an angle error shows as a pattern that drifts out of register away from the centre.
Four-mirror system. Four reflecting strips form a closed rectangle or square, and the image repeats in rows and columns.
Alignment has three conditions in every case. The angle is correct at the eye end. The angle is the same at the object end, so the strips are not twisted. The joint between the reflective faces is closed along its full length, with no gap and no step.
Mounting the mirrors in the tube
A prism of flat strips inside a round tube leaves empty space around it. In general, the mirror assembly has to be supported so that it stays centred and does not move when the piece is turned or carried, and the support must hold the glass without stressing it.
The object end of the mirrors should sit close to the object. The larger the gap, the less exactly the reflected edges join.
The eyepiece lens
Many simple kaleidoscopes have an open eyehole. Every instrument I build has a lens at the eyepiece, and the lens differs from model to model. The eyepiece also places the eye near the end of the mirrors, which is the position from which the reflected sectors appear most regular.
The object wheels
I pour and compose every wheel by hand. My wheels are cast in crystal-clear resin, holding coloured elements. Everything in the wheel is fixed: there is no loose or liquid component, and only the wheels themselves rotate. Cells with loose pieces or liquid are described in oil-filled vs dry-cell kaleidoscopes.
Because the placement is done by hand, the result cannot be repeated. No two pieces are alike.
In my pieces the wheel axle is mounted directly beside the mirror system, so the wheels pass in front of the open end of the mirrors. I build two-wheel and three-wheel models. With more than one wheel, the image is the overlap of the layers.
Teleidoscope: a different front end
A teleidoscope has no object wheels. My teleidoscope has a three-mirror system, a glass sphere at the front and a lens at the eye end. The sphere collects the scene in front of the instrument and the mirrors repeat it. The difference is explained in kaleidoscope vs teleidoscope.
Stand and engraving
The stands in my range are made of brass, wood or 3D print.
A piece can carry a laser engraving on the brass body, with a limit of 8 words. There is no mock-up or approval step before production, so the text has to be final and checked when it is sent. Commissions are described in custom brass kaleidoscope commission.
Checklist: what to check in a finished kaleidoscope
These are checks any buyer can make on any kaleidoscope. A kaleidoscope needs direct, preferably strong light, so look toward the light source and not in side light.
Seams: the lines where the reflections meet are thin and single, not doubled.
Sector equality: in a two-mirror image all sectors have the same width.
Centre: the meeting point of the mirrors reads as a point.
Mirror surface: a speck or scratch that stays in place while the wheel turns is on the mirrors, not on the wheel.
Wheels: each wheel turns through a full rotation without catching.
Body: the fitted parts sit evenly and nothing rattles when the tube is tilted.
FAQ
How are kaleidoscopes made?
A kaleidoscope is made from three assemblies. A tube forms the body and carries an eyepiece. Two or more mirror strips are set edge to edge at a fixed angle and mounted inside the tube. An object cell or a set of object wheels is placed at the far end. The mirrors repeat the object into a symmetrical image.
What mirrors are used in a brass kaleidoscope?
Studio Yabaye uses front-surface mirrors, cut to size for each model. The reflective layer is on the face that light meets first, so each reflection is single. A household mirror reflects from behind the glass and adds a weaker second image from the front face, which shows in a kaleidoscope as doubled lines between sectors.
Why does mirror alignment matter in a kaleidoscope?
In a two-mirror kaleidoscope the angle between the mirrors sets the number of sectors: 360 divided by the angle. A 45 degree angle gives 8 sectors and a 30 degree angle gives 12. If the angle is not an even division of the circle, the last sector is wider or narrower than the others.
What are kaleidoscope object wheels made of?
At Studio Yabaye every object wheel is cast in crystal-clear resin, holding coloured elements. Each wheel is poured and composed by hand, so no two pieces are alike. Everything in the wheel is fixed, with no loose or liquid component, and only the wheels themselves rotate. The range includes two-wheel and three-wheel models.
What finishes does a brass kaleidoscope come in?
Studio Yabaye pieces come in three finishes: matte, glossy and dark (blackened brass). The surface treatment varies from piece to piece and can be matte lacquer, wax, polish, or no coating at all. Brass is an alloy of copper and zinc, and an uncoated brass surface changes colour over time with air and handling.
Can a brass kaleidoscope be engraved?
Yes. Studio Yabaye offers optional laser engraving on the brass body, with a limit of 8 words. There is no mock-up or approval step before production and no photo of the finished piece before shipping. The text is engraved as received, so the buyer must send final wording that has already been checked.
About Studio Yabaye
Studio Yabaye builds kaleidoscopes and teleidoscopes with front-surface mirror systems in a brass tube, cut, fitted and hand-finished in the studio. Each object wheel is poured and composed by hand, so no two pieces are alike. The studio is based in Israel and ships worldwide. The current range is at all products, and questions can be sent through the contact page.
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