Travel to work area legal status. However, they give planners and geographers an alternate view of urban life as their boundaries are tied not to arbitrary administrative limits but socio-economic ties. Having an idea of where people commute from for work is particularly useful for public transport planning. Travel to Work Areas are defined by the Office for National Statistics using census data for commuting between wards, based on the different locations of individuals' home and work addresses. A Travel to Work Area is a collection of wards for which "of the resident economically active population, at least 75% actually work in the area,
Frank Verpillat shapes created by means of diachronic software. Since 2008, his work has been almost entirely dedicated to Lenticular High Relief using lenticular networks invented byGabriel Lippmann in 1908. The viewer, by moving laterally, observes, in 3D, a succession of elements which reveal themselves gradually in a sort of "layered" space. This led to Verpillat's theory concerning the "peripatetic" consumption of his work ("peripatetic", since one is obliged to move in order to see the whole) which he calls "paranoiaque feuilletée" ("strata paranoia") in homage to Dalí. Certain works in High Relief are abstract, some make use of diachronic forms, others