(Image credit: Apartment Therapy )
This expanding planter, Graine de Pot, is the design of Francois Clerc. The design responds to the needs of urban gardeners with limited space for storing pots in the off-season and is made from a biodegradable plastic that is safe for composting when the pot is no longer needed...
(Image credit: Apartment Therapy )
(Image credit: Apartment Therapy )
(Image credit: Apartment Therapy )

While the minimal explanation of the design on Clerc's site leaves a lot of questions unanswered, the idea of temporary planting vessels is one that could be further explored. Via: Core77.