It’s the wonders of Phong shading flat shading

If this is a serious question; they are from the program glxgears which is an opengl test program that renders them. So yes, they are 3d.

You should turn off ssh password logins on external facing servers at a minimum. Only use ssh keys, install fail2ban, disable ssh root logins, and make sure you have a firewall limiting ports to ssh and https.

This will catch most scripted login attempts.

If you want something more advanced, look into https://en.m.wikipedia.org/wiki/Security_Technical_Implementation_Guide and try to find an ansible playbook to apply them.