In certain fan communities, TMC refers to "The Missing Chapters" or "The Minecraft Club". In the context of "expansion" videos, it may also relate to specific creators or series dedicated to these visual tropes.
Shadows began to leak from the expanding glass, smelling of crushed lavender and ozone. The hourglass wasn't just holding time; it was growing a new, darker dimension. video title tmc fae dcay hourglass expansion
Maximal Hourglass (experimental)