Abstract: A chair includes a seat, a backrest, and an elastic link. The seat supports a user's buttocks, wherein the backrest supports the user's back, the elastic link elastically connects a side portion of the seat to a side portion of the backrest, the seat includes a seat free end formed at a rear portion thereof without being connected to the backrest and the backrest includes a backrest free end formed at a lower portion thereof without being connected to the seat.

Abstract: A chair includes a seat, a backrest, and an elastic link. The seat supports a user's buttocks, wherein the backrest supports the user's back, the elastic link elastically connects a side portion of the seat to a side portion of the backrest, the seat includes a seat free end formed at a rear portion thereof without being connected to the backrest and the backrest includes a backrest free end formed at a lower portion thereof without being connected to the seat.

Abstract: Embodiments of the invention include multi-functional power supply devices and related methods. In an embodiment, the multi-functional power supply device can include a base monument and a detachable accessory module. The base monument can include a first housing, an integrated power and support socket, an internal circuitry, AC electrical outlets, and DC electrical outlets. The detachable accessory module can include a second housing and an integrated power and support plug. The detachable accessory module can be configured to fit on top of the base monument. Other embodiments are also included herein.