An art medium applicator includes a rotating shaft and an art medium coupled thereto for causing the medium to travel through an application path for transfer to a substrate. The applicator includes a coupling assembly, and may include an applicator tip including a cavity into which the art medium is inserted and supported. An art medium modifier includes a rotating shaft and an art medium modifier coupled thereto for causing the modifier to travel through an application path for modification of an art medium previously applied to a substrate.

The method and apparatus described herein allows for the automatic retraction and extension of the writing element of a bistable self-retaining writing instrument. The method and apparatus consists of a writing element that is joined to the end of a flexible tube or material. These are inserted through a longitudinal channel formed along the outer surface of the writing instrument and are anchored only at the end opposite the writing element. When the bistable self-retaining writing instrument transitions from a coiled to straight configuration the writing element is automatically exposed. Conversely, when pushed into its coiled configuration the writing element slides back into the channel and is thereby protected. The flexible tube or material may also act as a reservoir for a writing substrate such as ink.

The method and apparatus described herein allows for the automatic retraction and extension of the writing element of a bistable self-retaining writing instrument. The method and apparatus consists of a writing element that is joined to the end of a flexible tube or material. These are inserted through a longitudinal channel formed along the outer surface of the writing instrument and are anchored only at the end opposite the writing element. When the bistable self-retaining writing instrument transitions from a coiled to straight configuration the writing element is automatically exposed. Conversely, when pushed into its coiled configuration the writing element slides back into the channel and is thereby protected. The flexible tube or material may also act as a reservoir for a writing substrate such as ink.

The method and apparatus described herein allows for the automatic retraction and extension of the writing element of a bistable self-retaining writing instrument. The method and apparatus consists of a writing element that is joined to the end of a flexible tube or material. These are inserted through a longitudinal channel formed along the outer surface of the writing instrument and are anchored only at the end opposite the writing element. When the bistable self-retaining writing instrument transitions from a coiled to straight configuration the writing element is automatically exposed. Conversely, when pushed into its coiled configuration the writing element slides back into the channel and is thereby protected. The flexible tube or material may also act as a reservoir for a writing substrate such as ink.