[mensetmanusman]

Might be even less.

Japan is huge on making very large graphics from printing on sheets of white adhesive: https://youtu.be/ioyMec7YU0Y

If they added it to the ground it cheaper to install and then kids could run on it in the gym (could easily cover an entire Gym, lol): https://youtu.be/mBjSM783Tug

Would be fun with the retroreflectors added like in the latter video, as with the lights off and only head lamps on you could see stars below your feet.

[beezle]

That's pretty neat. But I wonder what the surface looks like after removal?

[mensetmanusman]

Of the sticker? Very clean, because the adhesive is built to stick together like a command strip.

[beezle]

No, was thinking how does the wall look after removal? Does the adhesive take paint or other parts of the surface off?

[mensetmanusman]

I have worked with this type of material.

It depends a lot on the strength of the underlying layers.

If it is just cement, it takes bits of dust/debris with. If it is stained wood, it can peel some of the stain off if it is left on for a while. If it is painted drywall, it can peel off any little bits of poorly primed paint unless a heat gun is used to gently remove it by softening the adhesive (even this can be tricky though…). On glass it’s perfect :)

For a robust epoxied wooden gym floor, it would be a clean removal.