A photo on a solid white background of, from left to right, a human finger, a small 14mm black circle with squares etched onto it, a US dime (10 cent coin), a 25.4mm black PCB with 128 tiny 1mm LEDs, and a US quarter dollar coin.
https://cdn.masto.host/ledssocial/media_attachments/files/112/073/793/719/470/277/original/fb1dc3514363a723.png