The Ultimate in Contemporary Clocks
Chrono-Art Inc. Logo
Established 1971

Prisma TL or Prisma II

(Note: Both clocks make the same colors)

Prisma TL clock by ChronoArt Prisma II clock by ChronoArt
Prisma TL $559 (shown with standard hands)
Prisma II $479 (shown with the optional, not standard, hands)

The Prisma TL has been designed to come close to the original Prisma from the 1970's, but with the improvement of the LED's for the internal light source (no fluorescent lamps to replace) giving you more and better colors.

Prisma TL Prisma II
Rectangular hour and minute hands Standard Standard
Pointed hour and minute hands Optional Optional
Smaller eccentric second hand disk, larger disk is fixed in rear. Standard Standard
Larger dual disk second hand Optional Optional
Thick edge polished face lens Standard Not Available
Black case Standard Standard
Side covers, chrome colored plastic  Optional Optional
Side covers, gold colored Optional Optional
Price $559 $479
Customizing price, any combination of the above options for $15 $15 $15

New Light source

Now with more colors, better colors, and colors that do not repeat exactly twice/minute like the old versions, plus now even the background color changes. Also, a new brightness adjustment to brighten it up for an office or dim it down for a bedroom. This is accomplished with 20 red, 20 white, 20 blue, and 20 green Superflux LEDs driven by a microprocessor. No more fluorescent lamps to deal with like the original Prisma (not referring here to the cold cathode lamps in our first Prisma II, but the original Prisma from the 1970's). A wonderful improvement on a classic design.

Specials versions: Modifications are available for a flat $15 extra handling charge. Allow three day delay in shipping. A list of all the possible changes are listed in the table above.

Prisma II, chrome colored sides

Prisma II clock seen from leftPrisma II clock seen from right

Note the different color of the background depending on if you are viewing the clock from the left or the right. The sides are a chrome colored plastic. The sides look better than the picture above; the below picture is better.

Top edge with Aluminum sides

This is what the upper corners look like with plastic, chrome-color sides

Note the colors are better than the video and the flickering is a camera artifact. Sorry.

In 2001 we introduced the PRISMA II, an updated version of the Prisma changing clock from the 70's.  In 2012 we introduced the Prism TL with the thick edge-polished acrylic on the front. We have improved on the original. The lamps are long life LEDs , they slowly lose brightness – down 30% in 15-20 years. No fluorescent lamps to fuss with

What's so special about polarized light color changing? There are continuously changing colors and surprising color 'shifts' when the secondhand disk overlaps the minute & hour hands. There is something else going on! First you intuitively sense - something is wrong with the colors. Then you walk around while watching the clock and surprise --- the colors change depending on your viewing angle! Plus, inside the clock you see a clear secondhand disk changing through a magenta-blue-green-yellow color range, twice/minute as it rotates. It turns out, the color changes have to do with polarized light and a phenomenon called bi-refractance. Vectors of light are being rotated as they pass through each material which is very different from color filtering.

The case is flat black acrylic. The motor is the same big, strong metal gear, long life, as was in the original Prisma.

The best of contemporary design and engineering. Enjoy the Prisma for a lifetime and then pass it down to your descendants.

Prisma II, 4 clocks being tested

(The above picture is of an old fluorescent version we no longer make.)

To ask questions or place an order call 1-707-795-1895

To order over the internet go to home page and scroll down

International ordering information



LAMPS:      LED Light-emitting-diodes. Life depends on brightness set by user.

Default brightness (when you first plug it in) is 15 years to 30% less brightness.

CASE:         Matte black ACRYLIC  or plastic, CHROME-COLORED, TOP & SIDES. 

MOTOR: Big strong metal geared motor, usually lasts 20-25 years.

POWER:      120 VAC 60 HZ,  10 WATTS, (For information on 230 VAC, 50 HZ click here). 

WEIGHT:      Prisma II 5 LBS. Shipping weight 6 LBS.  Prisma TL shipping weight 8 lbs.

DIMENSIONS:  7.25 in. HIGH, 7 in. WIDE, 5 - 3/16 in. DEEP.  TL version is 6" DEEP.


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