A device for walking or running in place, especially for virtual spaces in
which two transport elements crossing each other at a right angle are
provided, which together form a walkable central surface, on which a user
walks forward, whereas, under him, the transport elements move at the
same speed. It is essential that the transport elements consist of rows
of square plates or tiles, which can be moved in rows in the X and Y
directions, where at all times a row of tiles is removed by a transfer
device and then shifted by 90.degree. or 180.degree..