All at sevens in the Roman Liturgy

Following on in part from my - and their - previous post which linked to their site the Liturgical Arts Journal has another interesting article about the origins and significance of the use of the number seven - seven deacons, seven sub-deacons etc - in the traditional Roman and Lyons Rites. 

The illustrated article can be seen at Seven Deacons, Seven Subdeacons, Seven Acolytes, Seven Candles - An Inquiry