20190626_162554 Šnipiškės: a triangular brick house
20190707_104929 Šnipiškės: three kinds of buildings
20190707_095725 The walled-off, gated ruins on the riverbank
P1020761 A dark-detecting solar-powered device?
I guess the point of this gadget demonstrated at Maker Faire 2008 is that it lights up when it detects dark.
The description of the Simple Solar Circuits group of exhibits from Evil Mad Scientist Laboratories says: "We demonstrate a few simple circuits -- that you can build yourself -- to make small solar and battery-powered night lights, garden lights, and decorations for Halloween."