Motion and maps...

This animation shows the space closing in around the person passing
through, with a plan view in the corner showing what actually happens
to the space.

Here comes the same animation played at different speeds, to check
which works best. First, 50% speed, twice longer than the original,
with structure elements shifting 1 pixel per 2 frames.

This appeared too fast, and I reduced the speed to 30% which stretched
the duration to three times of the original. Now the columns and wall
move at 1 pixel per 3 frames:

This on the other hand, was slightly too slow and I settled for 40% speed
which turned out all right: