One can naturally tile a Young diagram by horizontal rectangles, and the dual partition gives a tiling by vertical rectangles. Both points of view are used with Frobenius coordinates, which give a tiling of the Young diagram with horizontal (resp. vertical) rectangles above (resp. below) the diagonal. In this talk, we propose a way to tile a Young diagram where horizontal and vertical tiles are mixed. The tiling for an (e−1)(e−1)-tuple of partitions is given by a certain ee-regular partition, via a “caterpillar” reading of the ee-abacus. One can recover the e-regular partition from the (e−1)(e−1)-tuple of partitions via nested e′-regularisations for e′∈2,3,…,e.