After 539 Ravenna was reconquered by the Romans in the form of the Eastern Roman Empire (Byzantine Empire) and became the seat of the Exarchate of Ravenna. The greatest development of Christian mosaics unfolded in the second half of the 6th century. Outstanding examples of Byzantine mosaic art are the later phase mosaics in the Basilica of San Vitale and Basilica of Sant'Apollinare Nuovo. The mosaic depicting Emperor Saint Justinian I and Empress Theodora in the Basilica of San Vitale were executed shortly after the Byzantine conquest. The mosaics of the Basilica of Sant'Apollinare in Classe were made around 549. The anti-Arian theme is obvious in the apse mosaic of San Michele in Affricisco, executed in 545–547 (largely destroyed; the remains in Berlin).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Where are the remains of the apse mosaic of San Michele?
Ah, so.. Berlin

The majority of primary and secondary schools and further-education colleges in London are controlled by the London boroughs or otherwise state-funded; leading examples include City and Islington College, Ealing, Hammersmith and West London College, Leyton Sixth Form College, Tower Hamlets College and Bethnal Green Academy. There are also a number of private schools and colleges in London, some old and famous, such as City of London School, Harrow, St Paul's School, Haberdashers' Aske's Boys' School, University College School, The John Lyon School, Highgate School and Westminster School.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who overseas the public primary and secondary school systems in London?
Ah, so.. the London boroughs

Artspace on Orange Street is one of several contemporary art galleries around the city, showcasing the work of local, national, and international artists. Others include City Gallery and A. Leaf Gallery in the downtown area. Westville galleries include Kehler Liddell, Jennifer Jane Gallery, and The Hungry Eye. The Erector Square complex in the Fair Haven neighborhood houses the Parachute Factory gallery along with numerous artist studios, and the complex serves as an active destination during City-Wide Open Studios held yearly in October.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): For what annual New Haven art event, held in early October, is the Erector Square complex used? 
Ah, so..
City-Wide Open Studios