Identifying a set having a chair with a brown seat and circular base with surrounding gray pieces I bought a bunch of partial assemblies and bulk pieces. I want to identify what set this belongs to. 



I suspect it's a Star Wars set, but there were no minifigs nor decals to confirm my suspicion.
Your initial suspicion that this set was from Star Wars is...

"Most impressive." 

Good job!



Set #75077-1 Homing Spider Droid.