Doctor Eggman's chair

Doctor Eggman owns a floating chair that is seen in two cutscenes of Sonic Unleashed and also makes another appearance in Sonic Colors.

Description
It is a stylistic white chair with red chair padding and armrests with small hand pads. The most obvious feature is its lack of a footset, enabling it to float in the air. It is shown that Eggman is able to move anywhere he wants with his chair, although it is not known how he is able to do this. In Sonic Colors, it is also shown to be able to move back to its original place like a boomerang after Eggman kicks it to bounce around the room (though it was intended for comical purposes).

In Sonic Unleashed, Dr. Eggman's chair is seen at the front of the navigation bridge of Eggman's unnamed hideout, where the doctor can see the construction status of Eggmanland. The floating chair is once again seen in two cutscenes of Sonic Colors with minor changes. This time it is located in the main computer room deep inside the doctor's interstellar amusement park, where the computer displays status reports for the giant Mind Control Cannon. After the mind control cannon explodes and Eggman nevertheless decides to crushSonic, he rises to the upper tunnel section in his Nega-Wisp Armor with his chair. The chair has not been seen since then and was possibly destroyed along with the amusement park.

Trivia

 * Many years before Sonic Unleashed and Sonic Colors, a similar floating chair is featured in one of the pieces of concept art that originated during the production of Sonic the Hedgehog CD, which was later made available as unlockable content in Sonic Generations. Dubbed as the VCCI-811 "President's chair" in concept, it is possible that this chair would have worked as a boss vehicle or something similar that Eggman may have used as a replacement for hisEgg Mobile.
 * Incidentally, Eggman is also seen in an "actual" President's chair in Sonic the Hedgehog: The Movie.
 * The chair could be a loose combination of the real-life Tulip and Egg chair models, as Eggman's chair possesses the same color scheme as the Tulip model and the same shape as the Egg model.
 * Other incarnations of Doctor Robotnik are known to have their own chairs, even though most of them are used very temporarily. Robotnik from Adventures of Sonic the Hedgehog is seen to have one below the S.S.S.S.S. Squad logo in the episode "Boogey-Mania". Another one, more heavily armed and colored green, is used many times byRobotnik in the animated series and Archie Comics.