[1]: 301 In China, during the Tang dynasty, the discovery of a large footprint of the Buddha in Chengzhou caused Empress Wu Zetian to inaugurate a new reign name in that year, 701 CE, starting the Dazu (Big Foot) era.
[1]: 302 These were made during the pre-Greco-Buddhist phase of Buddhist art at Sanchi, Bharhut, and other places in India,[2]: 85 along with the Bo-Tree and the Dharmachakra.
[2]: 86 To clarify:[7] a footprint of the Buddha is a concave image of his foot (or feet), supposed to have been left by him on earth to purposefully mark his passage over a particular spot.
Following the traditional triple division of the cetiya,[8] we can assume that the first form of the image of the Buddha's feet – the concave one – is a sort of pāribhogika element, since it is indissolubly connected with the Tathāgata himself.
[9] According to French scholar Paul Mus, the footprints were the type of magical objects which "enables one to act at a distance on people related to it.