Elizabeth Barrette (ysabetwordsmith) wrote,
Elizabeth Barrette
ysabetwordsmith

  • Mood:

Visual Evolution

 ... drives the shape of pupils.  Don't put the wrong kind on your aliens or fantasy species.  How do you know the right kind?

1) If they're similar to a Terran species, just keep the same basic features.  So a catlike alien would tend to have vertical slits.  This is helpful if you want to use some of the really weird shapes.

2) If they're not similar to a single species, look for parallel evolution.  Were their ancestors predators (vertical slits), prey (horizontal slits) or active foragers (round)?

3) If they have a totally different shape, make sure you provide an explanation that makes sense.  Frex, hourglass pupils might have a separate rod/cone mix, so that each half would dominate under different lighting conditions.
Tags: how to, nature, news, reading, science
Subscribe

  • Today's Smoothie

    Today we made a smoothie with: 1 cup almond milk 1 cup Brown Cow vanilla yogurt 1 banana 1/2 cup fresh mulberries 1/2 cup ice This is bright purple…

  • Community Refrigerators

    Meet the Freedge, a source of free perishables. Community refrigerators are the newest form of Little Free Pantry, skyrocketing in popularity over…

  • Poetry Fishbowl Report for June 1, 2021

    This month's theme was "I never thought I'd have to say that." I wrote from 1:30 PM to 5:45 AM, so about 14 hours 15 minutes, allowing for…

  • Post a new comment

    Error

    default userpic

    Your IP address will be recorded 

    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.
  • 3 comments
That's a good point. Well made.
Regarding Traipahni eyes: the AKB, the Duenicallo, and the Shaokennah all have round irises, but I don't know if these rules apply. The way their eyes work is... interesting. They have no visible pupils in their irises, and no lines in their irises either. Their pupils are myriad and microscopic along the surface of the irises. I'm not sure, but I think the evolutionary benefit of this - aside from having both binocular AND non-binocular vision at the same time, due to greater area of the eyes that can see and those tiny pupils all facing different directions like a compound eye - is that the microscopic pupils are easier to repair, and easier to compensate for damage.

The planimals of Traipah are even weirder, in that they don't have eyes as such. They can see perfectly fine. To what level of detail, I don't know yet, but well enough that there are planimals that hunt by sight. One species looks something like green hairless dogs with no eyes, and teeth made of wood. (Planimals = similar to plants in that many are capable of making their own sugar with photosynthesis, but not all; and most planimals eat animals or plants or other planimals.) That species doesn't get much out of photosynthesis. Other species do; there are omnivorous/herbivorous prey planimals that the Ah'Koi Bahnis have domesticated, which are like walking bushes covered in a great many leaves.

Anyway, planimals have some kind of eyes, somewhere, somehow on their bodies. Probably even on their heads; at least some of the predators do. But they don't look like they have eyes. I haven't figured out the details yet.

I have another species, in my Lyria fantasy universe, called the Harun. [Hah-roon] Their eyes are pretty weird too. Their pupils look like crosshairs. Not sure why, other than that it looks disturbing. Also, their eyes have a magical ability; they can emit some kind of magic or radiation that lets them see not only in the dark, but also see through solid objects (like Moody's blue eye, in Harry Potter), make perfect 3D models of things by looking at them (like Hugh of Borg in Star Trek), and act like living MRI machines in that they can scan inside things and beings, even down to the DNA.

Their eyes also shapeshift, like the rest of their bodies, and can look like any kind of eye. But to use their special sight, they have to have the crosshair-pupils. And there's a brief but small flash of light whenever they first activate that ability.
Those sound cool.

I think the most unusual that I've made is the Eye of Fate in Monster House, which sees things that touch on destiny but not things that don't.