  Direct observation of vortex states confined in mesoscopic regular triangle
dots of amorphous MoGe thin films was made with a scanning superconducting
quantum interference device microscope. The observed magnetic images illustrate
clearly how vortices are distributed over the triangle dots by forming not only
commensurate triangular clusters, but also unique patterns imposed by
incommensurability. We discuss the results in terms of vortex shells and
construct the packing sequence of vortices in the multiple shell structure.
