We define two fundamental types of space - Static and Moving. In places of public assembly it is important to differentiate these and to plan for space utilisation. For example a concert will experience higher crowd densities closest to the front of stage, routes to and from entry/exit points, bars, concession etc. should all be differentiated in the site plan. From the links below you can view a 10m grid, against a tennis court backdrop, to assist in visualising crowd densities and crowd sizes. I'm going to produce a whole range of crowds against backdrops to act as both a training aid and to provide reference visuals for assessing both density and crowd numbers.