Notion motion was first installed at Museum Boijmans Van Beuningen in Rotterdam. It continues Eliasson's exploration of vibrations and wave patterns triggered by the viewers of his artworks. The installation consisted of three interconnected situations around a central wall. The first two situations were created by a wooden walkway running the length of the space, surrounded by a water basin that continued underneath the construction. Raised planks in the walkway functioned as wave activators, generating ripples in the water when visitors stepped on them. These were projected onto the surrounding walls, visualising the movement of the visitors around the gallery space. The third situation focused on ripples in the pool that were created by a sponge attached to a string, which dropped into the pool at regular intervals.