I'm not 100% sure but fast searching shows what this concept art is ~3-4 years old. They were here all along : r/Warframe
Decorations | WARFRAME Wiki | Fandom
Decorating the Dojo.... with Fish?!?! - General Discussion - Warframe Forums
Decorations | WARFRAME Wiki | Fandom
Decorations | WARFRAME Wiki | Fandom
Our Dojo Fish Tank | Fish tank, Dojo, Architect
Hey DE. Now that we have NPC models in the drydock, could we get them as placeable/poseable decorations for the rest of the dojo? : r/Warframe
Decorations | WARFRAME Wiki | Fandom
Decorations | WARFRAME Wiki | Fandom
Decorating the Dojo.... with Fish?!?! - General Discussion - Warframe Forums
Coming Soon: Devstream #162 - Page 3 - Livestreams & Contests - Warframe Forums
Fish Tank for Dojo? - General Discussion - Warframe Forums
More Dojo Decoration Variety. - Missions & Levels - Warframe Forums
Clan Dojo | WARFRAME Wiki | Fandom
Dojo Decoration Creations: Pirate Ship (Made With 358 Decorations), Giant Robot, And More - Fan Art - Warframe Forums
Devstream 112 | WARFRAME Wiki | Fandom
Warframe Dojo decoration competition entry Summer 2020: TennoDen - Album on Imgur
Warframe: Updates - XBOX Call of the Tempestarii: Update 30
![Warframe] Some Dojo Decorating Ideas - YouTube](https://i.ytimg.com/vi/bT_NYHSrszI/mqdefault.jpg "Warframe] Some Dojo Decorating Ideas - YouTube")
Warframe] Some Dojo Decorating Ideas - YouTube
Coming Soon: Devstream #125! - Livestreams & Contests - Warframe Forums
![Spring 2019 Featured Dojo Contest [Winners Announced]! - Page 8 - Livestreams & Contests - Warframe Forums](https://i.imgur.com/M9XqxDT.jpg "Spring 2019 Featured Dojo Contest [Winners Announced]! - Page 8 - Livestreams & Contests - Warframe Forums")