MoMA holds Casio’s SL-800 — the 1983 solar calculator the size of a credit card — in its collection, and has now dressed a DW-5600 in its red, cyan and chartreuse. The strap loop carries a picture of the calculator’s back, and the light button lights the MoMA logo in red across the LCD. Underneath it’s the ordinary 200-metre G-Shock: 1,000 pieces, $135 ($122 for members), MoMA Design Store only.