We exhibited a demo at ACM SIGGRAPH 2023 which was held from August 6th to 10th, 2023, in Los Angeles, USA. This year is the 50th anniversary of SIGGRAPH and some of the best interactive works shown at SIGGRAPH over the last 50 years were invited to the exhibition event called “Blasts From the Past“. Our demonstration, “Occlusion-capable Optical See-through Head-mounted Displays,” was originally exhibited in 2002, and this time we exhibited the latest successor, “Add-on Occlusion: Turning Off-the-Shelf Optical See-through Head-mounted Displays Occlusion-capable“. Please refer to this page for more information.