- Leap Motion hand-tracking can apparently be interfaced with an Arduino, as demonstrated in a short video shared in the channel.  
- Several members compared entry-level 4-channel oscilloscopes: the Rigol DS1074Z (with hacked-in signal generator) and the Siglent SDS1104X-E were both recommended, while a used Tektronix TDS 5104 was purchased second-hand for ~€1,600.  
- DIY microscopy came up: one participant previously owned an Oude Delft OD400 mirror microscope capable of sub-micron resolution and is considering building a second one from scratch by polishing a metal concave mirror.  
- A University of Arizona guide on hand-grinding metal mirrors for historical optics experiments was linked, sparking debate about whether 15th-century artists could have produced the necessary aluminum or brass components.  
- Discussion turned to David Hockney’s theory that Renaissance painters used optical aids; participants noted that art historians largely reject the idea despite visual evidence embedded in the paintings themselves.