The name of the sculpture is "Alat". See: https://sculpture.dittwald.com/sculptures/alat

Unable to answer "Do these traffic lights have a button to request a walk signal?" – Crossing With Pedestrian Signals – osm.org/node/391072823 via StreetComplete 58.0:

No button needed for walk signal.

Four way stop replaces with four way signalized intersection recently.

Unable to answer "What kind of building is this?" – osm.org/way/663869271 via StreetComplete 58.2:

This is some sort of structure between two apartment buildings that have different addresses. It does not have an entrance. It is attached to both apartment buildings.

In context of overlay "Addresses" – Retail Building – osm.org/way/663869005 via StreetComplete 58.2:

Multiple attached retailed buildings
1358,1360,1362,1384

Attached photo(s):
https://westnordost.de/p/227944.jpg

These two buildings are actually 4 attached retail buildings
1377,1375,1373,1371

via StreetComplete 58.2

1375 business is vacant

via StreetComplete 58.2

Bp 4 bollards

via StreetComplete 58.2

Attached photo(s):
https://westnordost.de/p/227945.jpg

BP at library
Bollards

via StreetComplete 58.2

Attached photo(s):
https://westnordost.de/p/227946.jpg

Unable to answer "What are the opening hours here?" – MoOng (Japanese Restaurant) – osm.org/node/502704890 via StreetComplete 58.1:

Cafe
"The Grind"