Help me ID this cartoon for Christy Karacas

Okay, I’m stumped. I get mail like this all the time and I try to be helpful. But this one just sounds so strange, I want to know what it is myself. It all started a few days ago when I got this email from animator Christy Karacas (Superjail):

Jerry,
I’m writing to you because there was a cartoon I remember seeing at the public library as a kid and have no idea what it is but really want to see it again. I remember a line drawing of a pair of legs, a giant eyeball (maybe a spider?) running around a castle. It was hand drawn. I know this sounds weird but thought you were the one to ask… I remember thinking this was really awesome-i feel like you might know it. thanks either way.

I requested more information. Was it a short or a feature? Anime or Saturday morning cartoon? Christy responded:

No it was a short film… I wish I could remember more about it. I’m so curious what it is… Not sure, but had a hunch it might be European. I saw it at my public library as a double feature with The Red Balloon as a kid…but…yeah, I dont really remember much more. I THINK there was no talking but not sure… I could draw how I remember the characters if you want?

Yes, please!

Hey Jerry-
These are SUPER QUICK SKETCHES (Ugh, the talkback will be about how shitty they are… hahhaah!), but I remember them running around a castle… up stairs I believe… and I think the eyeball was a spider. I can’t remmeber if it bounced around or changed size… maybe i am crazy and i should just do a ‘remake’ from my memory… a mash-up of sorts… create the animation from my childhood as best as I remember it because I can’t find it? hahaha. Amid-if you see or read these let me know if you know what I’m talking about…
Thanks!

If this rings a bell with you… please let us know in the comments below!

UPDATE: Our readers identified the mystery film. Find out what it is and link to it, in our comments section.