If you are sensitive to flashing images please do not read further.

There is a flashing image lower on this web page and you should only look at it if flashing images make you feel somewhere between neutral and great.

The image is made of a red square and a green one, with the red and the green switching spots ten times a second. In the centre of each square is an x.

If you are sure you want to do this:

Stare at the two x’s. Let your vision go a little blurry, until the two x’s overlap into a single one, as if you are trying to see the dolphin in the autostereogram on the wall in the dentist's office.

You may have an easier time getting the x’s to merge if you use your phone and hold it up close to your face.

Pay attention while the red and green flicker, and observe that the colour you are seeing in your mind behind the merged x is neither red nor green but really is both reddish and greenish at the same time.

There is no wavelength of light for this colour, and no combination of pigments will paint it. Brain red green is only for in your brain.

Stare at the brain red green until you have words to describe it.

After a long time please write the words down and post them on the internet.

If you are still doing OK despite the flashing images, you might enjoy this quicker version of the same picture, which flickers at roughly 24 frames a second.

If you are not doing OK, I apologize.

Please continue to enjoy colours that are too much for your eyes.

Today you will see a deep blue against a black background, and the blue will be deeply blue but also just as dark as the black. It will somehow be both lightless and rich.

Brain blue, or as it is called by pedants, stygian blue, is what lingers in your mind after you overdo it on yellow. It’s like a bruise and it slightly looks like one, although its blue is truer.

As with brain orange, seeing brain blue is a matter of staring. In the image below you will see a yellow circle with an x in the middle.

Look at the x. When the yellow flips to black, there, in the spot in your mind where the yellow just was, will be blue. There will be no light, but somehow there will be saturation.

Keep staring at the x as the animation repeats. Think about how brain blue is just as dark as black, yet not black. When you have had enough please feel free to go to another web site.

Hello and welcome back to hot sandwich, which you remember fondly and which, because your memory is failing and because every hiatus eventually must herniate, is now back on your computer.

Today on your computer you will see an orange (colour) more orange than any orange (fruit or colour) you have ever seen.

The formal name for what you are about to see is hyperbolic orange, but it is cooler and more accurate to call it brain orange. You are about to see brain orange with your brain, which is the only way to see it, because it is too orange for your eyes.

First: you will see a nice pale blue circle with an x in the middle. Stare at that x. Stare at it as if your continued participation in the meditation retreat depends on it. Which: it does. I am your meditation teacher right now and you can either stare at the x or get the hell off my web site.

After a while: the x and the blue circle will be replaced by a square of pure orange. You will see a phantom circle inside that orange, and the phantom orange will be more orange than the orange square. The phantom orange is brain orange.

The animation loops. Keep staring at the x. The brain orange will grow more impossibly orange with each repetition.

After a long time please feel free to go to another web site.