Step 1:
Place yourself somewhere high on a wall, like so


Step 2:
In the console, set your web distance to be something high, e.g. 5000


Step 3:
Enter FreeLook mode in the console.


Step 4:
Move the FreeLook camera beyond the wall that you are currently on, like so:

Note: you can change the speed of the FreeLook camera with the mousewheel

Step 5:
Look at an angle such that you are looking sligthly downward, like so:


Step 6:
Exit FreeLook in the console, and start holding left mouse immediately after. You should see the web appear before the camera goes back to the spider, like so:


Step 7:
Without releasing the left mouse button, jump with the spider. If everything goes right, the spider should clip through the wall. You may release the web as soon as it is through.

If you don't go through on the first try you can try going slightly lower/higher on the wall and changing where you're aiming in the FreeLook.

[Images of horrific spider clipping]


You are now out of bounds and can look at various easter eggs (figuratively and literally). Each map has its own different secrets.


For easier traversal of the out of bounds area you can disable gravity with
and undo it with
(tested to be the same as default gravity empirically).

Also, since the web distance is set to a large value, you can now aim to walls far away and get to very high speeds as you approach them.

If you would like to reset the web distance to the original value, you can do so with
(also tested to be the same as default distance empirically).