  Understanding the formation and evolution of high mass star clusters requires
comparisons between theoretical and observational data to be made.
Unfortunately, while the full phase space of simulated regions is available,
often only partial 2D spatial and kinematic data is available for observed
regions. This raises the question as to whether cluster parameters determined
from 2D data alone are reliable and representative of clusters real parameters
and the impact of line-of-sight orientation. In this paper we derive parameters
for a simulated cluster formed from a cloud-cloud collision with the full 6D
phase space, and compare them with those derived from three different 2D
line-of-sight orientations for the cluster. We show the same qualitative
conclusions can be reached when viewing clusters in 2D versus 3D, but that
drawing quantitative conclusions when viewing in 2D is likely to be inaccurate.
The greatest divergence occurs in the perceived kinematics of the cluster,
which in some orientations appears to be expanding when the cluster is actually
contracting. Increases in the cluster density compounds pre-existing
perspective issues, reducing the relative accuracy and consistency of
properties derived from different orientations. This is particularly
problematic for determination of the number, and membership, of subclusters
present in the cluster. We find the fraction of subclusters correctly
identified in 2D decreases as the cluster evolves, reaching less than 3.4% at
the evolutionary end point for our cluster.
