Curved elements attach under the legs of this wooden bench by Italian designer Andrea Rekalidis to turn it into a see-saw (+ slideshow).

Andrea Rekalidis' Twin Bench comprises a long plank and a pair of stable trestle-like legs, under which rounded bases can be added so the seat wavers back and forth.

The legs can be slotted into notches cut from the seat at each end, so the bench sways side to side, or in the middle of both long edges so it rocks up and down.

These changeable configurations are emphasised by the contrast between the dark coloured legs and the lighter seat.

Twin Bench was exhibited at trade fair Fiera Sun in Rimini, Italy, last week.

Other benches include aluminium seats meant to look like folded pieces of paper and street furniture designed for the V&A museum courtyard.

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See more furniture design »

Here is more information from the designer:

Twin is a modular bench with a social character. The main configuration of the central bench obliges anyone who sits to cooperate with a partner to serve as a counterweight on the opposite side, the front view evokes the icon of the scale, a symbol of fairness and equality.

In the others configurations Twin bench can turn into a swinging bench by adding the tracks or in a standard bench by moving the trestles at the opposite side, a dynamic object made to fit with different everyday life situations.

The joint between the seat and the stand is the structural core of the project, deliberately emphasised by the chromatic contrast of the components it add a visual character to the product.