New favourite example of complex structure: OREO.

seen from Malaysia
seen from T1

seen from Kazakhstan
seen from Slovenia

seen from Malaysia

seen from T1
seen from United States

seen from United States
seen from Hong Kong SAR China

seen from Italy

seen from Netherlands
seen from China
seen from Australia
seen from United States
seen from China
seen from Australia

seen from Belarus

seen from Türkiye
seen from Russia
seen from United States
New favourite example of complex structure: OREO.
The World’s Writing Systems is a website presenting one symbol from each of the 292 currently-known writing systems in the world, which you can sort in various ways, such as by name, time period, region, or Unicode support (whether you can view it on a computer without needing to use clunky workarounds). From the project description:
Unicode 11.0 (June 2018) covers exactly 146 writing systems. That’s an important milestone for worldwide communication and typography. But what about the missing scripts? How many of them are still out there? What do they look like?
This web site presents one glyph for each of the world’s writing systems. It is the first step of the Missing Scripts Project, a long-term initiative that aims to identify writing systems which are not yet encoded in the Unicode standard. As of today, there are still 146 scripts not yet encoded in Unicode.
They also have a cool-looking poster to bring attention to how many writing systems exist and which of them aren’t encoded yet.
This silkscreen poster presents one glyph for each of the 292 known writing systems of the world, together with their names, regions, and timeframes. A four colour code indicates living / historical scripts and Unicode encoded / not yet encoded scripts.
Here’s a talk with more information about the Missing Scripts Project and a note on which scripts the researchers are still looking into. For those scripts which are already encoded in Unicode, you can play around with them at the earlier project, DecodeUnicode.org.