One thing I notice is that, when using simple light and shade to color the direction of the planes, Trying to blend the color of the Catalyst Plane (the planes that causes the illusion, since I dont know how to call them XD) to the nearest correct plane value, and remove some lines, it makes the illusion stronger. On the left is my first attempt at coloring it, I felt something is not right, so I try alter it to the right picture

Practicing isometric drawing along with experimenting with different shading and line techniques to enhance a sense of depth. Also getting used to working with tracing paper and a light box!

Examples from demo + my own original illusions

A lot of staring before the "aha" moment. The first assignment had a "due date". Will there be future video commenting?

I’ve been trying to draw the Columns from the gateway to the fourth dimension

I strangely found this assignment to be therapeutic! I sat quietly with my drafting pencils, triangles, and T-square and went to work. I first did an adjoining impossible triangle. I was inspired by a single impossible triangle and tried to make it more interesting by directly joining it with another impossible triangle. The second page shows what looks like a TV on a stand. I found the shape to be interesting in that I could not figure out what it was supposed to be. This one was more of a tip-of-the-tongue image rather than a true optical illusion. The last page includes the letters "E" and "I" which I enjoyed drawing the most. I feel that I did pretty good with keeping the sides of each letter parallel to the other to make the image convincing in the absence of perspective. I had the letters go off the page on purpose to make the image even more convincing.

This is my first isometric drawing. I changed views and also the order of the objects we see. It changed completely the way we can see thing with the same contour shape. It is a fun exercise, thanks Marshall

Here is my attempt, it was more challenging than I thought it would be! The shading isn't where I would like it to be, and I had to improvise over a few mistakes, but everything is a work in progress.

Had a few ideas but ended up going with a Celtic knot design, which I found was a fun and easy way to get used to using the tools!

This type of stuff is so new to me. I only vaguely u.derstand some of these. I tried the same one out a couple times just to see.

Did a couple more of these, they're fun but they hurt my brain, credit to Carlos Perez and Miqdad down in the comments as I looked for inspiration to try to figure out some of their submissions and make variations of my own. Also tried to do the last one with the Oscar Reutersvard triangle cube illustration but I got stuck and hopefully someone can help me on this: How do you measure/find the space between each block and make it consistent? I can't figure it out.

This are not my cup of tea, so my brain hurts just from watching the video. So tried to keep it more on the basics. People are doing a fine job with the assignment nonetheless, nice to see :3

decided to do 2 more. the first one was like the 2 I did before. the second one with the cubes took a bit more. actually 3 tries before I could get it right. but did not start to really see it till I started inking it.

I'm very comforted by the comments below expressing having some challenges with this. So, as much as it's a little embarrassing I feel it's important to share for others as well that it took me 37 minutes and a headache to figure out how to use the triangles to create the generic isometric cube. Yeah... 37 minutes of trying to draw the default cube. It did eventually click, and after a break I returned and tried to draw some objects as optical illusions felt a little heavy in that moment. Flipping the perspective of the chair was quite difficult, and I did resort a bit to free handing some lines so it's pretty messy.

Since I've never done these before, so they took me a longer than I expected. I found them to be really fun puzzles though. I usually get impatient with drawing grids but some part of my brain wanted to make these perfectly neat and balanced. I found that drawing even grids really helped a lot with the spacing and was worth the extra effort. I definitely intend to do more of these but I noticed more videos came out so I figured I'd post what I have before I fall too far behind.

Here are a bunch of simple optical illusions I cooked up freehand. They aren't 100% grid perfect, but I think the lines can still work even if a little wacky; I just thought I might take the chance to practice line control, y'know?

Hi Marshall, Sorry about the delay but here are my humble attempts at isometric optical illusions. I hadn't used protractors and set squares (triangles) since leaving school so getting used to not drawing freehand was half the challenge, haha. I hope these are not too rudimentary. In the 1st 3 images, I used an isometric hexagonal 'cookie cutter' type of form and then played with the overlap at the midpoint to fake the view between looking up at it and looking down. In the next 3 images, I was reminded of an illusion I had seen in my childhood in an encyclopedia of pipes that looked connected as well as disconnected at the same time. In mine, the view could be either looking from outwards to in from the top set, or the bottom. I decided to omit the overlapping surfaces towards one end of the entire unit and vellum-ed over the missing lines, as well as one version of just one side being shaded. In the final 3 images, I drew a 3x3 grid of squares with one set of diagonals drawn in for them all. I then vellum-ed over a thickening of angles and shading of sides to give the impression of 3 boxes forming from a combination of diagonals and sides. I also did a version where one half of each square was shaded in to look like a grid of pyramids.

Thinking of Jim Hensons's Labyrinth...but failing at the attempt to construct a whole complex Escherlike illusion...so just a little visual fooling around...Great submissions, guys! Your work looks awesome!