Back in Cambridge

Being lucky enough to have been at the University at Cambridge, one now gets an alumni card so you can wander around the colleges looking like you belong. You can also get rights to read at the University Library and that is what I did today, having made sure I walked there through Kings' College and returning via Clare College.
In theory spending six hours in the library there should have brought back memories but I am not sure that I ever spent that long there when an undergraduate and certainly not in the map room.